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  3. Mary______my letter, otherwise she would have replied before now.

Mary______my letter, otherwise she would have replied before now.

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问题 Mary______my letter, otherwise she would have replied before now.
选项 A、has received
B、couldn’t have received
C、ought to have received
D、shouldn’t have received
答案B
解析 couldn’t have done sth．可用来表示对过去某一动作的否定推测，意为“不可能做过某事”，例如：He couldn’t have committed that crime because I was with him when themurder happened．他不可能犯罪，因为凶案发生时我和他在一起。ought to have done意为“本应该做(而实际上未做的)某事”，含有责备之意，例如：You ought to have helped himyesterday．昨天你本该去帮助他。shouldn’t have done sth．意为“本来不应该做某事(反而做了)”，含有责备之意，例如：You shouldn’t have told him about his illness．你本不该把他的病情告诉他。根据句子结构和下文内容我们可以看出该题应该选B。
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