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
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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
______, he can quickly find out what's wrong with the machine.
A. Having been well trained
B. Having well trained
C. To be well trained

D. To have been well trained
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