单项选择题

Smoking is ______ in many university classrooms in the United States.

A．permitted
B．taught
C．prohibited
D．revoked
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单项选择题
______ , he would have been able to pass the exam.
A．If he studied more
B．If he were studying to a great degree.
C．Studying more
D．Had he studied more
单项选择题
The plane ______ a few minutes after it took off and most of the passengers died.
A．collided
B．crushed
C．crashed
D．smashed
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