问题补充:
Are you still here?You were here half an hour ago. Who for?
A. were you waiting
B. did you wait
C. are you waiting
D. do you wait
答案:
A. were you waiting
B. did you wait
(答案→)C. are you waiting
D. do you wait
解析:根据题意,你还在这儿?你半小时前在这儿.可知下文叙述的是正在发生的事情,故用想现在进行时态,选C,你在等谁?