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

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MarybecameanAmericanwomandoctor____.A.inhertwentyB.inthetwentiethC.inhertwentiesD.inthetwenties为什么?M

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

Mary became an American woman doctor____.A.in her twenty B.in the twentieth C.in her twenties D.in the twenties 为什么?
这是固定短语 意思是在她20多岁的时候