问题
选择题
— We did not see him at the lecture yesterday．
— You _______ him, since I went to an international conference with him．
A．mustn’t have seen
B．can’t have seen
C．couldn’t see
D．needn’t have seen
答案
答案：B
考查情态动词。can’t have done不可能做某事。句意：——我们昨天在讲座上没看到他。——你不可能看到他，因为我和他参加一个国际会议。