She ____ know the answer ,but I'm not sure .A.maybe B.may为什么选B不选A_英语解答

She ____ know the answer ,but I'm not sure .A.maybe B.may
为什么选B不选A,请详解,

人气：455 ℃　时间：2019-08-21 07:52:56

解答

A为副词,不是情态动词,故谓语动词需加s,一般maybe反正句首.
may为情态动词,后加动词原形.