单项选择题

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

A．at ease
B．at random
C．at intervals
D．at large
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单项选择题
We often advise him not to drink more wine______ is good for his health.
A．as
B．than
C．that
D．but
单项选择题
Although he thought he was helping us to prepare the dinner, he was actually______ the way.
A．in
B．off
C．by
D．on
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