____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
问题描述：
____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
答
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?...