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He looked quite healthy though he was ____ A at the age of s

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He looked quite healthy though he was ____ A at the age of seventy B in his seventies 为什么答案是B
A哪里错了呢?
He looked quite healthy though he was ____ A at the age of s
这个句子有语境的话就比较好解释.
A跟B的表达都没有错.不过A的意思是“70岁”,而B的意思是“70多岁”,A的意思很精确,B就比较模糊一点,如果没有精确的信息表明他是70岁,那么选B更好.