Mr. Blake __________my letter, otherwise he would have replied by now.
A．will not have receivedB．needn’t have received
C．shouldn’t have received D．couldn’t have received
D
考查情態(tài)動詞。couldn’t have done不可能做過某事。句意：布萊克先生不可能收到我的來信，否則如今他會回復了。
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