One reason that we haven’t had his letter is that he it to our old address by mi
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One reason that we haven’t had his letter is that he ________ it to our old address by mistake．
A.might send
B.may have sent
C.should send
D.should have sent
试题答案
B
他可能已经把信错发到旧地址了。对过去进行推测：may have done…