题目内容

He____know the answer, but I’m not sure.
A. maybe    B. may be    C:may    D. must
C

试题分析：句意：他可能知道这个答案，但是我不确定。根据后面的一句but I’m not sure可知应该用表示不肯定的情态动词may来表示；maybe 副词 意思是大概、或许may be 表示可能是……，后接名词、形容词may为情态动词，接动词原形；must为情态动词，意为“必须”，后面接动词原形；故选C。
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