单选题：At the beginning of class, the noise of desks _______ could ..

题目内容：
At the beginning of class, the noise of desks _______ could be heard outside the classroom. [ ] A. opened and closed
B. to be opened and closed
C. being opened and closed
D. to open and close
参考答案：

himself to supporting his brother’s son,he has to let one ..

himself to supporting his brother’s son,he has to let one of his children leave school. [ ]A.Having committed B.Committed C.Being committed D.To commit

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Look over there-there's a very long, winding path ________ ..

Look over there-there's a very long, winding path ________ up to the house. [ ]A. leadingB. leadsC. ledD. to lead

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_ that she didn't do a good job, I don't think I am abler ..

_ that she didn't do a good job, I don't think I am abler than her.[ ]A. To have said B. Having saidC. To sayD. Saying

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_____ a written permission, he had to write another letter t..

_____ a written permission, he had to write another letter to the president of the university. [ ]A. Not giving B. Not having been given C. Having not given D. Having not been given

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Diana, ________ for months to find a job as a waitress, fina..

Diana, ________ for months to find a job as a waitress, finally took a position at a local advertising agency. [ ]A. strugglingB. struggledC. having struggledD. to struggle

分类：现在分词的被动式  题型：单选题
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