单项选择题

If he had remembered () the door, this would not have happened.

A. to have been closed
B. to have closed
C. having closed
D. to close

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单项选择题
We () on it for many hours but we have not yet reached any conclusion.

A. work
B. have been worked
C. have been working
D. are working
单项选择题
I wish I () longer this morning, but I have to get up and come to class.

A. could have slept
B. slept
C. might have slept
D. have slept
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