I _______ have been more than six years old when the accident happened．
A．shouldn’tB．couldn’tC．mustn’tD．needn’t
：B
：考查情態(tài)動詞用法。Shouldn’t have done本不應(yīng)該做某事，實際上卻做了。Couldn’t have done不可能做某事；needn’t have done本不需要做某事，實際上卻做了。句意：當(dāng)事故發(fā)生的時候，我不可能超過6歲。根據(jù)句意說明B正確。
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