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  3. I________him the Christmas gift by mail because he visited me during the Christmas holiday.

I________him the Christmas gift by mail because he visited me during the Christmas holiday.

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问题 I________him the Christmas gift by mail because he visited me during the Christmas holiday.
选项 A、ought to have sent
B、couldn’t have sent
C、must have Sfent
D、needn’ t have seat
答案D
解析 ought to have done本应该做(但实际上却没有做)；couldn’t have done不可能做了某事，表示对过去发生事情的否定推测；must have done肯定做了某事，表示对过去发生事情的肯定推测；needn’t have done本没必要做(但实际上做了)。根据句意可知，选D。
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