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
It ______ our teacher came that we began the examination.
A．was until
B．is until
C．was not until
D．is not until
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