I _______ have been more than six years ...

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 【解析】：考查情态动词用法。Shouldn’t have done本不应该做某事，实际上却做了。Couldn’t have done不可能做某事；needn’t have done本不需要做某事，实际上却做了。句意：当事故发生的时候，我不可能超过6岁。根据句意说明B正确。

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