When ____ about the secret of his success,he owed it to his parents.1.was asked2.to ask3.asking4.asked
问题描述：
When ____ about the secret of his success,he owed it to his parents.
1.was asked
2.to ask
3.asking
4.asked
答
4
答
答案是第四个.当问到成功的秘密时,他把它归功于他的父母.他被别人问.