When he is ,he becomes interested in science.a.on his thirties b.in his thirty c in his thirties d.at his thirties 的意思!

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When he is ,he becomes interested in science.a.on his thirties b.in his thirty c in his thirties d.at his thirties 的意思!

When he is ,he becomes interested in science.a.on his thirties b.in his thirty c in his thirties d.at his thirties 的意思!
When he is ,he becomes interested in science.
a.on his thirties b.in his thirty c in his thirties d.at his thirties 的意思!

When he is ,he becomes interested in science.a.on his thirties b.in his thirty c in his thirties d.at his thirties 的意思!
abd是错误搭配,英语中没有这种介词短语.C是正确短语,in ones thirties指在某人三十几岁的时候

A吧，
在他30多岁的时候，他变得对科学非常赶兴趣。

c in his thirties
在他三十岁的时候，其他的表达方式不对

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