The boys （ ）.That is why their hair is wet A.have been swimming B.have swumC.have been swumD.swim答案是选A为什么不选C或B呢?The boys ___________ just now.That is why thier hair is wet.A.have been swimmingB.have swum求详解

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The boys （ ）.That is why their hair is wet A.have been swimming B.have swumC.have been swumD.swim答案是选A为什么不选C或B呢?The boys ___________ just now.That is why thier hair is wet.A.have been swimmingB.have swum求详解

The boys （ ）.That is why their hair is wet A.have been swimming B.have swumC.have been swumD.swim答案是选A为什么不选C或B呢?The boys ___________ just now.That is why thier hair is wet.A.have been swimmingB.have swum求详解
The boys （ ）.That is why their hair is wet A.have been swimming B.have swum
C.have been swum
D.swim
答案是选A为什么不选C或B呢?
The boys ___________ just now.That is why thier hair is wet.
A.have been swimming
B.have swum
求详解

The boys （ ）.That is why their hair is wet A.have been swimming B.have swumC.have been swumD.swim答案是选A为什么不选C或B呢?The boys ___________ just now.That is why thier hair is wet.A.have been swimmingB.have swum求详解
have been swimming s是现在完成进行时,表达一个过去一段时间里在进行的动作,而且很有可能以后将继续做下去,
本句里面就是表达这些男孩过去一段时间内在游泳,而且接下去的时间他们很可能还会继续游泳.跟他们头发是湿的配合,
C是have been done结构,这种结构表达被动语态,意思变成这些男孩被游泳了,所以不对.
其实B才是更迷惑的选项,语法上没错,have swum表达在过去某段时间内,这些孩子游泳,但是现在已经停止,所以他们的头发可能晾干了,答案A就更符合上下文.,
第二题因为加了just know,所以题干就表达了游泳这个活动已经结束的意思,那就只能选have swum

这句话是过去进行时，根据时态过去，排除D选项，根据过去进行时排除B,C选项。所以这道题选A。 希望可以采纳我的答案~

C 是肯定不对的，被动语态，不可能的
A 的时态是现在完成进行时，表示事件从过去的某个时间发生，一直延续到现在，并有可能一直延续下去
他们的头发是湿的，用的是一般现在时，可见他们还在游泳，由此用现在完成进行时
下一题只能填swam，游泳的过去式，因为此句中just now 这个时间状语是一般过去时的标志...

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C 是肯定不对的，被动语态，不可能的
A 的时态是现在完成进行时，表示事件从过去的某个时间发生，一直延续到现在，并有可能一直延续下去
他们的头发是湿的，用的是一般现在时，可见他们还在游泳，由此用现在完成进行时
下一题只能填swam，游泳的过去式，因为此句中just now 这个时间状语是一般过去时的标志

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男孩游泳是主动所以排除C B 表示游泳结束 不一定就是目前 从后面一句可以判断男孩游泳的动作有可能还没结束

swum just now 点明了游泳动作结束

A

A是现在完成进行时，由于正在游泳，所以湿。
B是现在完成时，无进行之意，不选
C是被动语态
B因为是刚才
求采纳

因为这个句子里有 just now， just now的意思就是 刚才，这个句子的意思就是 这个男孩刚才在游泳，这就是他的头发为什么是湿的的原因。而C的意思就是 被游泳 B则是去游泳，强调动作的完成，不符合题意。 从而选A

够详细了吧，呵呵呵呵

A，现在完成进行时，是过去的某一点到现在，一段时间内在游泳，所以现在这一刻头发是湿的。强调动作的持续性。
B，强调动作的完成。
C，“被游泳”？还是咋滴，不能这样用吧。
D，不用解释了，肯定不选。

To the boys life in the country is more interesting than that in the city. The book about ____ the boys are talking is very interesting.A that B which bill is ()()of the boys 英语翻译Do the boys and girls have the same favorite subjects?The answer is no.There are many differences（不同）between boys and girls at school.As we know,sometimes we say boys like math and girls like English.That's right.Many boys like P. The ________(state)that boys are cleverer than girls is wrong However,the percentage of the boys choosing “great figures” is the same as that of the girls.meaning? There are 42 students in S1A.The number of boys is 4/3 times that of girls.Find the repective number of boys and girls there. The boys （ ）.That is why their hair is wet A.have been swimming B.have swumC.have been swumD.swim答案是选A为什么不选C或B呢?The boys ___________ just now.That is why thier hair is wet.A.have been swimmingB.have swum求详解 Jim is one of the boys ___ from England A who is B who are C that coems 为什么呢? Jim is one of the boys ___ from England A who is B who are C that coems 10个英语短语!急Do the boys and girls have the same favorite subjects?The answer is no.There are many differences（不同）between boys and girls at school.As we know,sometimes we say boys like math and girls like English.That's right.Many boy Tom is _____ of the two boys. who is the tallest a___the three boys Jim is (tall)of the two boys. she is saying ____to the boys. the book about ______the boys are talking is very interesting.为什么这里要用which,用that 为什么不行? Football is so interesting game that boys all over ht world play it.改同义句是the不是ht the most important thing we did is that we learned to be good boys .的否定句