单项选择题
A.under
B.over
C.on
D.at
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单项选择题
A.whenB.whetherC.ifD.for
A.when
B.whether
C.if
D.for
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单项选择题
A.involvingB.interferingC.hinderingD.intervening
A.involving
B.interfering
C.hindering
D.intervening
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