I couldn’t have sent him the Christmas gift by mail because he came home during

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问题 I couldn’t have sent him the Christmas gift by mail because he came home during the Christmas holidays.

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答案 couldn’t—needn’t

解析根据下文可推测此句意为“我本不必把圣诞礼物给他邮去，因为他圣诞节期间回家了”。因此主句用了一句与过去事实相反的表示必要性的情态动词。

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