He must be helping the old man to water the flowers，？A. is heB. isn't heC. must beD. must

发布时间：2020-08-17 09:24:41

He must be helping the old man to water the flowers，    ？
A. is he
B. isn't he
C. must be
D. mustn't he

网友回答

A. is he
(答案→)B. isn't he
C. must be
D. mustn't he
解析：must在此表猜测，是“一定”之意，此时反意疑问句部分以must之后的动词为准，所以B项正确。
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