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I have been more than six years old whe...

 I       have been more than six years old when the accident happened .

A. shouldn’t      B. couldn’t      C. mustn’t    D. needn’t

 

 B 【详解】本题考查情态动词表示否定推测的用法。当这个事故发生的时候,我不可能已有六岁以上了。表示对过去的可能性的推测,shouldn’t have done sth. “原本不应当做某事然而做了” mustn’t “禁止” needn’t have done sth.“原本没必要做某事,然而做了” couldn’t have done sth. “过去不可能做过某事”。 故选答案B。
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