C may表示可能,如果用maybe就不是动词,后面的动词作谓语know必须跟主语she用三单knows才对,但现在后面是动词原形,所以前面这个空格要用谓语,B也是情态动词但已经有了know就不要再用be,must表示肯定地推测都错
She ___ know the answer,but I'm not sure.A.maybe B.may be C.
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