— When you to learn to ride your bike？ — I really can’t remember the time.A. do; beginB.

问题补充：

— When you to learn to ride your bike？

— I really can’t remember the time.

A. do; begin

B. did; begin

C. have; begun

D. had; begun

答案：

A. do; begin

(答案→)B. did; begin

C. have; begun

D. had; begun

解析：本题根据语境看判断是一般过去时，故选B