He’s to know the answer.   A. likely B. probable C. maybe D. probably

问题描述:

He’s to know the answer.   A. likely B. probable C. maybe D. probably
是不是选C,

he's =he is
is 本来就是be动词了.maybe是情态动词.一个句子不可能有两个动词.所以maybe明显不可能,.
这句话是他可能知道答案.
可能的短语表达形式be likely to.
所以应该选A