问题补充:
When the elevator doors open, stand aside and let everyone out you try to get in.
A. unless
B. although
C. until
D. before
答案:
A. unless
B. although
C. until
(答案→)D. before
解析:考查连词:A. unless 除非B. although虽然C. until直到D. before在…前面,…才…,句意:当电梯门打开的时候,要站在一边,让大家出来你才能进去。选D。