while when 后面的从句语法问题,还有as soon as

drive应属于延续性动词
when 引导时间状语时,若主从句主语一致或从句主语为it且从句谓语动词含be的形式,可省略从句的主语及be 部分.
例：When (I was) walking on the street,I came across Mary.我在街上漫步时遇上了玛丽.
A young man was riding his bicycle very fast while (listening) to an MP3.这道题中listening就是以上我说的
I'll let you know ( C ) Mary comes back.
A.so soon B.until C.as soon as D.while
as soon as 的用法与if一样,都是主将从现,意为：marry一到我就会让你知道 ；until意为直到“我告诉你”的这个动作不会一直持续,as soon as 意为“一、、就”
when和while在以下情况可以互换
it started rain when he is reading
=it started rain while he is reading（当从句是延续性的动作时,并且前后两个动作是一短一长,when 和while能互换）
when和while在以下情况不可以互换
i’m sleeping while he is reading（两个都是长动作时,只能用while）
总之while后一定要跟长动作

A young man was riding his bicycle very fast while (listening=he was listening) to an MP3
I'll let you know ( C ) Mary comes back.
A.so soon B.until C.as soon as D.while
as soon as一。。。就。。。他一回来我就让你知道

1.driving是非谓语短语(=he was driving,高中二年级内容),之后的listening同样,=he was listening2.until是"直到...才停止",而not until是"直到...才开始做",你两个混淆了