I began to learn__a bicycle at seven years old

I began to learn__a bicycle at seven years old I began to study English when I was seven years old.同义句 His father began to work____ he was seven years old. His father began to work he was seven years old A.as old as His father began to work____ he was seven years old.A.as old 同义句转换.1 When he was seven years old,he began to go to school His father began to work _____ he was seven years old 带讲解 Cherry began to learn the piano when she was seven years old 英语：他7岁就开始学习英语 Seven years old he began to study english His father began to work since he was seven years old.这个句子有错 I learned how to a bicycle when I was six years old. 　　 　　A. When I was seven years old