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She ______ know the answer, but I’m not sure.
A.maybeB.may beC.mayD.must
C

试题分析:maybe副词,可能,也许;may be可能是;may情态动词,可以,可能,表示推测语气;must必须,一定。句意:她可能知道这个答案,但是我不太肯定。结合语境可知选C。
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