Lucy and Lily are both ________ girls.A.twelve years old B.twelve year old C.twelve-years-old D.twelve-year-old

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Lucy and Lily are both ________ girls.
A.twelve years old B.twelve year old C.twelve-years-old D.twelve-year-old

答案D twelve-year-old作定语,修饰girls;year用单数.查看原帖>>