___what age did your sister learn to write是选in还是at

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___what age did your sister learn to write是选in还是at
___what age did your sister learn to write是选in还是at

___what age did your sister learn to write是选in还是at
应该是 at
分析如下:本题其实主要考察“在某一年龄”的英语表达,我们常说 at ten ,at seven之类的,这是固定表达,所以此处应填 at

AT

At

at
at the age of 18类似

at

at