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
当must表示推测时，其后反意疑问句部分的时态取决于实际时态而不是must后的形式; 本题中“失去工作”的动作发生在过去，因此用did来反问。