I ________ have been more than six years old when the accident happened．
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答案B
shouldn't have done不应该做而实际上做了；couldn't have been不可能是……；needn't have done没必要做某事而做了；此外无mustn't have done结构，结合句意可知B项正确．
shouldn't have done不应该做而实际上做了；couldn't have been不可能是……；needn't have done没必要做某事而做了；此外无mustn't have done结构，结合句意可知B项正确．
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