3. With more forests being destroyed, huge quantities of good earth ______each year.

A. were washed away B. is being washed away

C. are washing away D. are being washed away

解析：因good earth(沃土) 与wash away(冲走) 是被动关系，排除C;又因quantities of…作主语，谓语动词用复数，排除B;指近阶段(近些年) 正在发生的事，用现在进行时，排除A;故选D。

4. —The window is dirty. —I know. It ______ for weeks.(www.yygrammar.com)

A. hasn’t cleaned B. didn’t clean C. wasn’t cleaned D. hasn’t been cleaned

解析：由is和for weeks可知，要用现在完成时态，排除B和C;又因It (The window) 与clean是被动关系，要用被动语态，所以选D。

5. —George and Lucy got married last week. Did you go to the wedding?

—No, I ______. Did they have a big wedding?

A. was not invited B. have not been invited

C. hadn’t been invited D. didn’t invite

解析：因为I与invite是被动关系，又因为邀请应当发生在结婚之前，got married是过去，invite就该是过去的过去，所以用过去完成时的被动语态，只有C正确。

6. The mayor of Beijing says that all construction work for the Beijing Olympics _____ by 2006.

A. has been completed B. has completed

C. will have been completed D. will have completed

解析：因“by+将来时间”通常与将来完成时连用，所以由by 2006可排除A和B;又因为work与complete是被动关系，所以要被动语态，只有C正确。

7. Be careful when you cross this very busy street. If not, you may ______run over by a car.

A. have B. get C. become D. turn

解析：you与run over是被动关系，选项中只有get才可与过去分词run构成被动语态，故选B。

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