1. It worried her a hit _______ her hair was turning grey.
A. while B. that C. if D. for
2. You will be late _________ you leave immediately.
A. unless B. until C. if D. or
答：B．It为形式主语，that从句为真正主语。
3. _________ the days went on, the weather got worse.
A. With B. Since C. While D. As
答：D． As the days went on. 随着时间一天天地过去。
