单项选择题

The word "poem" is concrete, ______ "poetry" is abstract.

A．when
B．as
C．while
D．since
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单项选择题
The clock ______ and we realized it was two o'clock.
A．hit
B．struck
C．knocked
D．rang
单项选择题
The patient suffering from a cough soon found ______ to give up smoking.
A．it is necessary
B．necessary
C．it necessary
D．that necessary
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