用may或may be填空:She ( ) know the answer to this math problem,but I'm not so sure.

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用may或may be填空:She ( ) know the answer to this math problem,but I'm not so sure.
用may或may be填空:She ( ) know the answer to this math problem,but I'm not so sure.

用may或may be填空:She ( ) know the answer to this math problem,but I'm not so sure.
may.
know是动词,不能直接跟在BE后面.实在要就要变为被动,不过感觉逻辑不对
PS:maybe那么两个都可以

用may
may 是情态动词,相当于can,而may be分开的话你可以就把它当作 be动词,比如is,那答案就显而易见了。

may
know已经是动词了,不必加be

may