答案:A

（7）When________,the museum will be open to the public next year.

C.being completed

D.to be completed

提示:时间状语从句和主句为同一主语，且从句谓语中含有be动词，可省略从句中的主语和be动词。museum和complete是被动关系。

答案:A

（8）-You should have thanked her before you left.

-I meant ________,but when I was leaving I couldn't find her anywhere.

A.to do B.to C.doing D.doing it

提示:mean to do sth.表示"打算做某事"，而mean doing 表示"意味着"。由语境须用动词不定式作宾语，此处省略了不定式，只保留了动词的不定式符号to。

答案:B

3.定语从句与名词性从句中的省略

（1）在限制性定语从句中，作宾语用的关系代词whom,which,that可省略；在以the same...as和such as引出的某些定语从句中，也可省略与主句相同的部分。

The girl(who/whom/that)the teacher spoke to is Li Yan.

老师与其说话的那个女孩是李燕。

I don't like such books as this (is).我不喜欢这种书。

（2）定语从句中的"主语+系动词be"可以省略。

The goods(which were) ordered last month haven't arrived yet.

上个月订购的货物还没到达。

（3）在与suggest,request,order,advise等词相关的名词性从句中，应用虚拟语气形式"should+动词原形"，should可以省略。

It is suggested that we (should) go to see the film.

有人建议我们去看电影。

4.动词不定式省略，只保留to的场合

不定式作某些动词的宾语时，常见的动词如like,love,hope,wish,expect,refuse,mean,try,agree等。

You can do it if you mean to.

如果你愿意可以这么做。

5.介词的省略

（1）一些与动词、名词或形容词一起搭配的介词常省略，而保留其后的动名词，常见句型有：

have difficulty/trouble(in) doing sth.

be busy (in) doing sth.

stop/prevent sb. (from) doing sth.

The heavy rain prevented him (from) arriving there on time.

大雨使得他没能准时到达那里。

（2）表示时间的介词at,on和in 用