问题补充:
—It’s 9 o’clock now. I must go.
—It’s raining outside. Don’t leave it stops.
A. when
B. since
C. while
D. until
答案:
A. when
B. since
C. while
(答案→)D. until
解析:句意:现在是九点。我必须走了。外面在下雨。等雨停了再走。When当……的时候; since自从;while当……的时候; until直到,常用于句型not…until,所以选D.