He is () than her sister.A,four year older B,four years older

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He is () than her sister.A,four year older B,four years older
He is () than her sister.A,four year older B,four years older

He is () than her sister.A,four year older B,four years older
B
He is four years older than his sister
他比他的妹妹大四岁.
A,four year older B,four years older的区别在于four是否加S,年龄是可数的所以用fours.

B, year前面有four修饰,为复数,只有当four-year作为形容词使用时才用单数

B