He began to learn Chinese(when he was 5 years old)对括号部分提问__ __ he__ to learn Chinese?

问题描述:

He began to learn Chinese(when he was 5 years old)对括号部分提问__ __ he__ to learn Chinese?

When did begin为什么用when提问因为括号部分指的是时间(以when开头),对时间提问就用when。