单项选择题

The meeting was so prolonged and exhausting that ______ the speakers stopped for refreshments.

A. at large
B. at ease
C. at intervals D. at random
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单项选择题
Greater effort to increase food production must be made if we ______ meet an increasing demand by the growing population.
A. can
B. may
C. are to
D. should
单项选择题
The boys and girls______ together round the camp fire telling stories and singing songs.
A. reversed
B. clapped
C. clustered
D. contracted
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