单选题Mr. Green _____ my letter, otherwise he would have replied before now.Amust have receivedBmust have failed to receiveCmust receiveDmust fail to receive
单选题
Mr. Green _____ my letter, otherwise he would have replied before now.
A
must have received
B
must have failed to receive
C
must receive
D
must fail to receive
参考解析
解析：
句意：格林先生一定没收到我的信，否则他应该已经回信了。据此可以排除A、C。这里是对过去没有收到信进行推测，应该用must have done，故为B。
句意：格林先生一定没收到我的信，否则他应该已经回信了。据此可以排除A、C。这里是对过去没有收到信进行推测，应该用must have done，故为B。
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