单项选择题

During the discussion, Mr. Boyd remained silent when asking his opinion.

A．During the discussion
B．remained silent
C．when
D．asking
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单项选择题
It usually takes much less time to fly from one country to another than traveling by train.
A．less
B．another
C．traveling
D．by
单项选择题
When he found he hadn't enough money to pay for the meal, he was very much embarrassing.
A．hadn't
B．pay for
C．very much
D．embarrassing
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