单项选择题

There are, more than fifty proposals______ at the conference.

A．discussing
B．having been discussed
C．discussed
D．to be discussed
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单项选择题
Hardly______ the helicopter______ when the waiting crowd ran toward it.
A．had; landed
B．has; landed
C．did; land
D．was; landing
单项选择题
The time has come______ we can make extensive use of nuclear energy.
A．as
B．while
C．when
D．since'
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