单项选择题


A．go back to
B．go on with
C．go over and over
D．stand by
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单项选择题
A．indifferentB．difficultC．impossibleD．possible
A．indifferent
B．difficult
C．impossible
D．possible
单项选择题
A．increaseB．causeC．reduceD．raise
A．increase
B．cause
C．reduce
D．raise
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