单项选择题


A.prevent
B.require
C.assist
D.forbid
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单项选择题
A.attributingB.contributingC.distributingD.explaining
A.attributing
B.contributing
C.distributing
D.explaining
单项选择题
A.to requireB.requiredC.requiringD.are required
A.to require
B.required
C.requiring
D.are required
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