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

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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

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
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

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

我认为应该选B。。。。。。

answer :B;;; no doubt

B.后面可以跟When she was 6 years old 或者at the age of 6

B,前面是现在完成时才可以用A,