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    精英家教网 > 高中英语 > 题目详情
    Bob said he was going to join our club but he didn’t. What a shame! He ______ his mind.
    A．can’t have changedB．mustn’t have changed
    C．wouldn’t have changedD．shouldn’t have changed
    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。
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