Helearnedwellenoughtoplaythepiano

发布时间：2020-07-10 02:35:23

He learned well enough to play the piano to the public when he was ________.













A.at the age of 12 years old












B.a twelve years old boy











C.a 12-years old boy











D.a twelve-year-old boy

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D解析导解：year在此结构中不用复数．
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