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

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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
单项选择题
(), he already knows what career he wants to follow.

A. Young as he is
B. As he is young
C. As young he is
D. As young as he is
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