单项选择题

The government ______ the effect of the pollution.

A. have well aware of
B. well be aware of
C. was well aware of

D. well have aware of
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单项选择题
The reason ______ he did not arrive in America as scheduled was that his flight was called off because of the bad weather.
A. when
B. why
C. which
D. where
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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