She________ know the answer, but I'm not...

She________ know the answer, but I'm not sure.

A. maybe B. may be C. may D. must

Ｃ【解析】试题分析：句意:他可能知道答案，但是我不确定。maybe 可能，大概，是一个副词，常放在句首；may be 可能是，是情态动词may 后跟be 的原形；may 可能，情态动词，表示推测；must 必须，一定，因为句中有I’m not sure，故这个选项不对；故选Ｃ。考点：考查情态动词。

考点分析：

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