单项选择题

A knowledge of several languages is essential to the study of comparative literature because without them one can read only in translation.

A．knowledge
B．without them
C．only
D．in
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During the discussion, Mr. Boyd remained silent when asking his opinion.
A．During the discussion
B．remained silent
C．when
D．asking
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
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