问题
选择题
--- Daniel must have lost his job in that unemployment crisis, __________he?
--- I don’t think so．Yesterday I saw him working together with his colleagues.
A．didn’t
B．doesn’t
C．mustn’t
D．hasn’t
答案
答案：A
考查反义问句，前面的句子用must have done，反义问句要看有没有过去时间，有就用过去时，没有就用现在完成时，这句话时间是in that unemployment crisis在那场就业危机中，所以用过去时。选A。