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  3. Steven______my letter: otherwise he would have replied before now.

Steven______my letter: otherwise he would have replied before now.

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问题 Steven______my letter: otherwise he would have replied before now.
选项 A、has received
B、should have received
C、couldn’ t have received
D、ought to have received
答案C
解析 本题考查情态动词的用法。根据题意可知，本句是对过去发生事情的否定推测，所以应用couldn’t have done,意为“一定没有做过某事”。should／ought to have done表示“过去本应该做某事”。故选C。
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