题目内容
He must be helping the old man to water the flowers, ______?
A.is he | B.isn’t he | C.must he | D.mustn’t he |
B
解析
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题目内容
He must be helping the old man to water the flowers, ______?
A.is he | B.isn’t he | C.must he | D.mustn’t he |
B
解析