238.He must be helping the old man to water the flowers,_______?(陕西)
A.is he B.isn’t he C.must he D.mustn’t he
说明原因.
人气:156 ℃ 时间:2020-02-15 08:47:03
解答
选Bisn't he在这个语境中的MUST表示对正在进行的动作进行推测,将其不看做情态动词.而且MUST后面有助动词BE,所以反义疑问句根据BE来构成
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