单项选择题

He must have come here yesterday evening, ______ he

A．did
B．has
C．haven't
D．didn't
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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
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
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