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
答
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