Tina’s sister began to ride a bike to school ___________.

问题描述:

Tina’s sister began to ride a bike to school ___________.

A. when 6 years old


B.at the age of 6



C. at the age of 6 years

D. at 6
years old

这道题应该选B at the age of...表具体年龄即具体时间
——丶寒冰烈