At the end of last month ten primary schools with the help of Project Hope. A. had set u

问题补充：

At the end of last month, ten primary schools with the help of Project Hope.

A. had set up

B. had been set up

C. set up

D. were set up

答案：

A. had set up

B. had been set up

C. set up

(答案→)D. were set up

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