问题描述：
34.It was raining hard,they has to stay at home.
34.It was raining hard,they_____ stay at home.
A.must B.would C.had to D.could
前面是they为什么用has to 而不用must?
34.It was raining hard,they_____ stay at home.
A.must B.would C.had to D.could
前面是they为什么用has to 而不用must?
问题解答：
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