Children in China go to school when they are six years old.Children in China go

游客2025-07-10 16

问题 Children in China go to school when they are six years old.
Children in China go to school ______ of six.

选项

答案 At the age

解析用at the age代替when they are six years old指在六岁时。介词短语相当于 when引导的时间状语从句。

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