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

NASA is casting a wider net in the space shuttle investigation as to what caused the spacecraft to swing out of control and ______ moments before it was to land.

A．disassemble
B．disembark
C．disintegrate
D．disinherit

单项选择题

We had a marvelous holiday; only the last two days were slightly ______ by weather.

A．damaged
B．enhanced
C．spoiled
D．diminished

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