用适当的连词填空,关于had(just)done..when..刚做完…这时…的用法.
I had gone only a few steps _____ I realized that my greeting had been impolite.
It was only ____ I has turned the corner of the street that I realized,too late,that his name was Tony and the time was late afternoon.
=Only _____ I has turned the corner of the street,I realized,too late,that his name was Tony and the time was late afternoon.
为什么第一个填before,第二个填when,第一个不可以填before吗?