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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
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.

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