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

解析虚拟语气。主句用了一句与过去事实相反的表示必要性的虚拟语气，needn’t have done表示“本不必做(结果却做了)”，符合题意。

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