would have to, had to 的区别

Kate didn't go to the movie last night since she ______ the baby for her sister until 9 o’clock.

A .would have to look after

B.had to look after

这个句子，实际是考查 “因果关系”。

原因：since she had to look after the baby for her sister until 9 o’clock

结果：Kate didn't go to the movie last night

“凯特昨晚没有去看电影” —— 这个结果已经存在。根据因果的“先后关系” ，那么，原因（照看孩子）一定发生了，而且早于结果发生。“过去将来时” （would have to do）意味着“尚未发生”，违背逻辑。

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蒋学文 - 英语教师 1秒前

擅长：英语

答案为 B。用一般过去时表示过去的客观事实。