题目内容
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 |
B
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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题目内容
| A.is he | B.isn't he |
| C.must be | D.mustn't he |