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He was late for work this morning because he_____find his key.
A、mustn't
B、wouldn't
C、couldn't
D、shouldn't
【正确答案】：C
【题目解析】：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。