Bob said he was going to join our club but he didn’t. What a shame! He his mind.A. can’t

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。