单项选择题
A.on the average
B.on the other hand
C.on condition
D.while
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单项选择题
A.in despairB.in generalC.on dutyD.on business
A.in despair
B.in general
C.on duty
D.on business
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单项选择题
A.at leastB.at mostC.for certainD.with ease
A.at least
B.at most
C.for certain
D.with ease
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