He was late for work this morning because he________find his key.

mustn't

wouldn't

couldn't

shouldn't

查看答案

参考答案: C

本题考查情态动词辨析。句意:他由于找不到钥匙,今天早上上班迟到了。 mustn't表示“禁止”; wouldn’t表示“不会”; couldn't表示“不能”; shouldn't表示“不应该”。根据句意,本题选C。

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