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题目
____to carry him?1 did they have 2 had they 3 must they 4 have they 选择哪一个,及分别说出每一个为

提问时间:2020-11-07

答案
尽管must=have to,但后者中的have是助动词,可以适用的时态范围更广.选1 did they have2 应该改为:Did they have to carry him?3 应该改为:must they carry him?4 应该改为:Do they have to carry him?...
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