25. I ______ have been more than six years old when the accident happened.
A．shouldn’tB．couldn’tC．mustn’tD．needn’t
B
本題考查情態(tài)動(dòng)詞的用法。must表示推測只能用于肯定句，否定句用can或could 代替。shouldn’t have done 表示“本來不該而實(shí)際上卻做了某事”.needn’t have done表示“本來不必而實(shí)際上卻做了”均不合題意。本句的意思是：當(dāng)事故發(fā)生時(shí)我不可能超過6歲。
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