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
We were suddenly _________ when I was speaking to John on the phone.
A．hung
B．cut down
C．cut off
D．hung back
单项选择题
You must have the experience that you find your voice _________ on the telephone.
A．distorted
B．irregular
C．twisted
D．deformed
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