单项选择题

The discussion was so prolonged and exhausting that ______ we had to stop for refreshments.

A．at large
B．at ease
C．at random
D．at intervals
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单项选择题
Russian women had to wear protective masks as they walked in Moscow, which was ______ by a heavy smog yesterday.
A．shrouded
B．unveiled
C．decayed
D．deprived
单项选择题
He was ______ when he heard the unexpected news, but I finally convinced him.
A．incredible
B．inevitable
C．incredulous
D．indifferent
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