________,hebecameadoctor．A.Attheag

发布时间：2020-07-26 20:13:16

________, he became a doctor．A.At the age of twentiesB.In his twentiethC.By the time he was twenty-fourD.When he was twenty-four years old

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D解析A选项可改为At the age of twenty．B选项可改为In his twenties．C选项的时态错了．排除下来，D选项正确．
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