---How old is your sister? --She is than I.A. older six yearsB. six years olderC. six yea

问题补充：

---How old is your sister? --She is than I.

A. older six years

B. six years older

C. six years elder

D. older by six year

答案：

A. older six years

B. six years older

(答案→)C. six years elder

D. older by six year

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