She________know the answer．But I'm not sure．A.maybeB.may beC.mayD.must
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C解析分析：ButI'm not sure．说明不很有把握，“可能性”要用may，不能说may be know(be和know都是动词原形)。maybe是副词。所以选C项。(延伸)know是没有进行时的动词，所以虽然是现在时间，不能说may be knowing．(题型变化)She may know the answer．＝Maybe(Perhaps)she knows the answer．＝It is possible that she knows the answer．＝It is possible for her to know the answer．