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He____know the answer, but I’m not sure.
A:maybe  B:may be  C:may  D:must
C
may情态动词表推测,后接动词原形
maybe是副词,作状语(perhaps)
may be作谓语,译成可能是
maybe是副词,意思是“也许、可能”,在句中作状语,相当于perhaps,常位于句首。在may be中,may是情态动词,be是动词原形,两者构成完整的谓语形式,与主语形成系表结构,意为“也许是、可能是”。 may就是可能的意思,是一个情态动词,后面加动词原形。Must意思是必须,表示肯定意思,后接动词原形。从动词know及下文我不确定来看,选项C。最符合题意。
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