单项选择题


A.what
B.as
C.those
D.which
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单项选择题
A.BecauseB.WhetherC.ThoughD.If
A.Because
B.Whether
C.Though
D.If
单项选择题
A.to requireB.requiringC.requiredD.are required
A.to require
B.requiring
C.required
D.are required
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