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25. I ______ have been more than six years old when the accident happened.
A.shouldn’tB.couldn’tC.mustn’tD.needn’t
B
本题考查情态动词的用法。must表示推测只能用于肯定句,否定句用can或could 代替。shouldn’t have done 表示“本来不该而实际上却做了某事”.needn’t have done表示“本来不必而实际上却做了”均不合题意。本句的意思是:当事故发生时我不可能超过6岁。
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