[請益] must 和 had to 選哪個?

作者: chocomacha (chocomacha)   2019-01-07 20:10:34
這個句子是克漏字的一部分
By the time they started to feel better, it was already the sixth day and
they ___ the next day.
(A)must leave
(B)had to leave
(C)was to leave
(D)want to leave
答案:B
想問的是
為什麼答案不能選A
作者: EVASUKA (若獅子)   2019-01-07 21:24:00
must+原形不能用於過去had to或ought to可以倒退,must不可
作者: chocomacha (chocomacha)   2019-01-09 19:52:00
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