单项选择题

It was recommended that passengers ______ smoke during the flight.

A．not
B．need not
C．could not
D．would not
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单项选择题
It was not until midnight ______ the snowcapped peak.
A．that they sighted
B．that they did not sight
C．did they sight
D．had they sighted
单项选择题
______ is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals.
A．That
B．It
C．This
D．As
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