— We did not see him at the lecture yesterday．
— You _______ him, since I went to an international conference with him．
A．mustn’t have seenB．can’t have seen
C．couldn’t seeD．needn’t have seen
B
考查情態(tài)動(dòng)詞。can’t have done不可能做某事。句意：——我們昨天在講座上沒看到他。——你不可能看到他，因?yàn)槲液退麉⒓右粋�(gè)國際會(huì)議。
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