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  3. He must have waited here for an hour, ______?

He must have waited here for an hour, ______?

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问题 He must have waited here for an hour, ______?
选项 A、didn’t he
B、mustn’t he
C、hasn’t he
D、must he
答案A
解析 情态动词表推测，需要打回原形再行判断。其实该句子=He waited here for an hour. 所以选didn’t he?
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