At the beginning of class, the noise of desks _____ could be heard outside the c

题型：同步题难度：来源：

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

答案

举一反三

_____ many times, he finally understood it.

[ ]

A. Told
B. Telling
C. Having told
D. Having been told

题型：同步题难度：| 查看答案

— Mum, is the pair of gloves ____ mine?
— Yes. You have to wear another pair.

[ ]

A. washing
B. have washed
C. having washed
D. being washed

题型：同步题难度：| 查看答案

____ by a crowd of people, I felt nervous, ____ what to say.

[ ]

A. Watching; didn"t know
B. Having watched; and not knew
C. Having been watched; not known
D. Being watched; not knowing

题型：同步题难度：| 查看答案

His letter, _____ to the wrong number, reached me late.

[ ]

A. having been addressed
B. to have addressed
C. to have been addressed
D. being addressed

题型：同步题难度：| 查看答案

He asked who was the man ____ on.

[ ]

A. to be operating
B. operating
C. to operate
D. being operated

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