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Unless         to speak, you should remain silent at the conference.

A. invited                             B. inviting

C. being invited                          D. having invited

 

答案:A
提示:

主句主语与invite具有被动关系,故此处应使用表被动关系的过去分词invited。unless invited to speak相当于unless you are invited to speak。

 


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1. A. Besides                            B. Instead

C. But                               D. Therefore

2. A. though                           B. for

C. if                                  D. unless

3. A. enough                            B. too

C. much                              D. yet

4. A. because                           B. what

C. whether                               D. that

5. A. when                             B. though

C. however                            D. while

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C. has                               D. takes

7. A. treated                           B. received

C. accepted                           D. carried

8. A. smell                             B. look

C. sign                                D. taste

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C. begins                             D. comes

10. A. followed                          B. eaten

C. treated                                 D. taken

11. A. carried                           B. brought

C. served                             D. sent

12. A. and                              B. of

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C. come                              D. serve

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C. fail                                D. manage

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C. none                               D. both

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C. usually                              D. often

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C. remain                                 D. keep

 

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