问题
选择题
Mr. Blake __________my letter, otherwise he would have replied by now.
A．will not have received
B．needn’t have received
C．shouldn’t have received
D．couldn’t have received
答案
答案：D
考查情态动词。couldn’t have done不可能做过某事。句意：布莱克先生不可能收到我的来信，否则如今他会回复了。