He has done a lot of work,___ necessary to our study.A.which I think is B.which I think it is C.I think which is D.which I think is itWhich one?why?

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He has done a lot of work,___ necessary to our study.A.which I think is B.which I think it is C.I think which is D.which I think is itWhich one?why?
He has done a lot of work,___ necessary to our study.
A.which I think is B.which I think it is
C.I think which is D.which I think is it
Which one?why?

He has done a lot of work,___ necessary to our study.A.which I think is B.which I think it is C.I think which is D.which I think is itWhich one?why?
A I think是插入语,可以当成没有,就是which is.考察which引导的非限定性定语从句

楼上正解。
which 引导非限定定语从句，which代表前面那句话。意思是：我认为他很用功（这件事情）对学习很必要。

A 非限制性定语从句

A.
when B says it, it is refering to a noun. C is out of order as which should be at the beginning and it seperates the thought. D does the same thing as C, and indicates that there would be another noun.

He has a lot of he has a lot of homework ___ A to do B do C doing D done He has a lot of work done today哪里错了,请改正 He has a lot of friends 中文翻译 He becomes very famous He has a lot of m_________ He usually has a lot of w___ homework.? has,of,he,questions,a,alway,lot连词成句 He has a lot of CDs. 改为反义疑问句 He has a lot of things —— He alwags has a lot of new things to learn He has a lot of money 可以说a lot of money 是宾语然后a lot of修饰money吗 This kind of p_ （药） has done me a lot ofgood. a lot of work___by robots in that workshop every day我觉得是is done,那是不是has been done 英语,下面两者有何区别?他替我完成了很多活.书上翻译是:he has done a lot of work with me.但我翻译是:he has done a lot of work for me.两者有何区别? He has( )to do.A.a lot work B.a lot of works C.a lot of work D.a lot works he has a lot of money.he`s really a r____ man 一般现在时和现在完成时区别1.He does business in Australia and makes a lot of money.2.He has done business in Australia and has made a lot of money.请不要把语法书里写的抄过来,我已经看过了,就是不懂才来问的,我想 He has to do () this afternoon.A.many work B.a lot of works C.a lot of work