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Mary became an American woman doctor____.

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Mary became an American woman doctor____.
A.in her twenty B.in the twentieth C.in her twenties D.in the twenties
Mary became an American woman doctor____.
选c in her twenties
in one's twenties 在某人20几岁的时候
A、in her twenty 在他的二十,语法不通,不选
B、in the twentieth 在第二十,语意不通,不选
D、in the twenties 是二十年代的意思,语意不通,不选