单项选择题

A.to require
B.requiring
C.required
D.are required
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单项选择题
A.extendingB.performingC.illustrating.D.conducting
A.extending
B.performing
C.illustrating.
D.conducting
单项选择题
A.yetB.onlyC.everD.even
A.yet
B.only
C.ever
D.even
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