Mr.Smith began to learn painting _____ his sixtiesA.in B.of C.at D.over 选哪个?为什么?C为什么不对?

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Mr.Smithbegantolearnpainting_____hissixtiesA.inB.ofC.atD.over选哪个?为什么?C为什么不对?Mr.Smithbegantolearnpain

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

Mr.Smith began to learn painting _____ his sixtiesA.in B.of C.at D.over 选哪个?为什么?C为什么不对?
A in
in his sixties表示在他60多岁的时候
短语in one's+ 基数词,表示在某人多少岁的时候
这句话的意思是史密斯先生在他六十多岁的时候开始学习绘画.
C选项如果把后面his sixties改成sixty,at sixty(在六十岁时)就对了

A
in his sixties 在他六十多岁时

A

A
in one's +基数词复数 在某人的多少岁时