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，D符合题意。

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