问题
They__________on the program for almost one week before I joined them, and now we ________on it as no good results have come out so far.
A:had been working; are still working
B:had worked; were still working
C:have been working; have worked
D:have worked; are still working
B:had worked; were still working
C:have been working; have worked
D:have worked; are still working
正确答案是：
同类题型
1． Jenny theUSA the day after tomorrow, because she is going to the school there.
Don’t play with water, you’ll get yourself all ________/wet/.
Few of them hurt themselves in the accident last night , __________
Try as you _______, he won’t listen to your advice on the potential dangers of smoking. [ ]