单项选择题

61（）

A．region
B．field
C．place
D．case

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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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Hardly______ the helicopter______ when the waiting crowd ran toward it.
A．had; landed
B．has; landed
C．did; land
D．was; landing
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