单项选择题
A.at
B.on
C.of
D.over
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单项选择题
A.avoidB.preventC.refuseD.prohibit
A.avoid
B.prevent
C.refuse
D.prohibit
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单项选择题
A.ifB.thoughC.asD.whether
A.if
B.though
C.as
D.whether
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