She________ know the answer, but I'm not sure.
A．maybeB．may beC．mayD．must
Ｃ

試題分析：句意:他可能知道答案，但是我不確定。maybe 可能，大概，是一個(gè)副詞，常放在句首；may be 可能是，是情態(tài)動(dòng)詞may 后跟be 的原形；may 可能，情態(tài)動(dòng)詞，表示推測(cè)；must 必須，一定，因?yàn)榫渲杏蠭’m not sure，故這個(gè)選項(xiàng)不對(duì)；故選Ｃ。
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