问题补充:
Bob said he was going to join our club but he didn’t. What a shame! He his mind.
A. can’t have changed
B. mustn’t have changed
C. wouldn’t have changed
D. shouldn’t have changed
答案:
A. can’t have changed
B. mustn’t have changed
C. wouldn’t have changed
(答案→)D. shouldn’t have changed
解析: 考查情态动词与虚拟语气。shouldn’t have done 本不应该做某事而实际上做了,can’t have done/ wouldn’t have changed表示对过去的推测,不可能,must表推测不用于否定句中,句意:鲍勃说要加入我们的俱乐部但是他没来。多遗憾呀,他本不应该改变主意的。故选D。