单项选择题
A.system
B.instrument
C.mean
D.solution
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单项选择题
A.whenB.untilC.asD.while
A.when
B.until
C.as
D.while
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单项选择题
A.moreB.lessC.more or lessD.much
A.more
B.less
C.more or less
D.much
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