Mary became an American woman doctor____.A.in her twenty B.in the twentieth C.in her twenties D.in the twenties

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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

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