单项选择题

By the time I left the school, the professor ______ that class for two years.

A. has taught
B. had taught
C. will have taught D. will teach

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单项选择题

I can’t ______ what has happened to the vegetables, for they were freshly picked this morning.

A. figure out
B. work out
C. look out
D. turn out

单项选择题

A. She is having a headache.B. She thinks the man is nervous.C. She wants to leave.D. She is waiting for the doctor.

A. She is having a headache.
B. She thinks the man is nervous.
C. She wants to leave.
D. She is waiting for the doctor.

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