Bob said he was going to join our club b

问题选择题

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

答案：D

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。