The driver of the red car() when a black one came up very quickly. A was just startingB has just started C would just start out D is just starting out
问题描述：
The driver of the red car() when a black one came up very quickly. A was just starting
B has just started C would just start out D is just starting out
答
选A 结构是 be doing sth...when.
译为“正在做某事,突然...”