I was on my way to the bookstore and was waiting the green light at a crossing when a girl of about ten was knocked on by a passing car, it drove off quickly.
此句说是要把it改为which，由于是非限定定语从句，可是假如把when引导的从句看成时间状语从句，而it drove off quickly.为时间状语从句的主句 it为主句主语又有哪些不对吗？
这句子哪个写的，其它错误一并纠正
I was on my way to the bookstore and was waiting for the green light at a crossing when a girl of about ten was knocked down by a passing car, which drove off quickly.
when在这里表示忽然，句子表示的是女生忽然被车撞了。
假如你用it，你要表达的是汽车忽然跑了，即便这样也要把“汽车忽然跑”放在when之后，所以一定是错的。