问题

Why do you look so worried —My computer broke down and my essay ______ unfinishedsince.
A:had left
B:has left
C:has been left
D:was left
B:has left
C:has been left
D:was left
正确答案是:
同类题型
We cannot understand a disease ________ we understand the person who has the disease.[ ]
I argued with my best friend yesterday,____ he was still willing to help me.
Two decades ago this city was ______ but asmall unknown town.
Two hundred miles ______ a long distance ______ in two hours even by a fast car
Linda sleeplate, but now she gettingup early to catch the bus.