Mr.Smith began to learn painting _____ his sixtiesA.inB.ofC.atD.over选哪个?为什么?

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Mr.Smithbegantolearnpainting_____hissixtiesA.inB.ofC.atD.over选哪个?为什么?Mr.Smithbegantolearnpainting___

Mr.Smith began to learn painting _____ his sixtiesA.inB.ofC.atD.over选哪个?为什么?
Mr.Smith began to learn painting _____ his sixties
A.in
B.of
C.at
D.over
选哪个?为什么?

Mr.Smith began to learn painting _____ his sixtiesA.inB.ofC.atD.over选哪个?为什么?
A
in+one's+几十岁的复数表示在某人几十多岁的时候
上句的意思是史密斯先生在他六十多岁的时候开始学油画

C
固定说法,在年龄之前要AT。