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问题: 英语单项选择一题

Ask Tom. he ______ know the answers.

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

解答:

选A. may 表可能性

may 情态动词,意思是‘也许,或许,恐怕’(表推测);‘可以’(表许可)
The news may be true.这个消息或许是真的/可能是真的。
You may come any time.你随时可来。

maybe 副词,意思是‘也许,可能’同perhaps
Maybe it will rain tonight.