I ________ him the Christmas gift by mail because he came home during the Christmas holidays.

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问题 I ________ him the Christmas gift by mail because he came home during the Christmas holidays.

选项 A、ought to have sent
B、couldn’t have sent
C、must have sent
D、needn’t have sent

答案D

解析主句用了一句与过去事实相反的表示必要性的虚拟语气，符合题意。

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