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
Would you like some juice or coffee—- ________ is OK. I really don’t care.
I ran all the way to the post office, only ___ that it had closed.
When lost in work , ______ he often was , he would forget all about eating and sleeping
am, ______ to climb the world’s second tallest mountain twice, finally decided to give up.