作业帮1.— There’s someone knocking at the door.Who could _____ be?— I have no idea.A.he B.it C.she D.that为什么答案是B,D为什么不对?2.At one time we had about eighty people here who did nothing but_____into various family history.A.research
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1.— There’s someone knocking at the door.Who could _____ be?— I have no idea.A.he B.it C.she D.that为什么答案是B,D为什么不对?2.At one time we had about eighty people here who did nothing but_____into various family history.A.research
1.— There’s someone knocking at the door.Who could _____ be?
— I have no idea.
A.he B.it C.she D.that
为什么答案是B,D为什么不对?
2.At one time we had about eighty people here who did nothing but_____into various family history.
A.researched B.research C.researching D.to research
答案为什么是B,而不是C?
3._______ harder,you would have passed this exam.
A.If you have worked B.If you worked C.Were you to work D.Had you worked
答案为什么是D而不是A?
4.Your hair needs _________.You’d better have it done tomorrow.
A.cut B.cutting C.to cut D.being cut
D选项为什么不对?
5.When _______ to dinner at the White Rose Restaurant,he seemed very happy and accepted the invitation.
A.invited B.inviting C.to be invited D.having invited
为什么C不对呢?
1.— There’s someone knocking at the door.Who could _____ be?— I have no idea.A.he B.it C.she D.that为什么答案是B,D为什么不对?2.At one time we had about eighty people here who did nothing but_____into various family history.A.research
1.因为听见敲门声,你并不知道是男是女,在英语习惯中,用it 代替.接电话也是一样的,通常会说:"who is it?"
2.时态一致.but 前用的是did ,所以but 后应该用researched.
3.这是一个省略句.还原后应该是"if you had worked".后面跟的是"would have"前面应该用“过去的过去”时态,所以用"have worked "不对.
4、need后要么接不定时,要么接动词原形,不接v.+ing时态
5、when后面不能接不定式.
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1,someone你并不知道是男的是女的,所以用it 。 至于that ,我是凭语感。
2 B是动词，C是名词
3这是IF条件句的省略形式，从句有主语了，所以主句用省略
4 主动与被动的关系你还是看一下把
5 独立成份与疑问词冲突。