Tom______ my letter; otherwise he would have replied before now.

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问题 Tom______ my letter; otherwise he would have replied before now.

选项 A、ought not have received
B、shouldn’t have received
C、has been received
D、couldn’t have received

答案D

解析句意：汤姆不可能已经收到了我的信，否则他到现在就早该回信了。选项Couldn’t have been表示推测，符合句意。因此选D。

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