[請益] must 和 had to 選哪個?
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
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