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

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

A. had set up B. had been set up C. set up (答案→)D. were set up解析：考查试题和语态。句意：在上个月底，在希望工程的帮助之下，十所小学被建设了。本题的时间状语是at the end of last month,这是一个过去时的时间状语。同时根据句意说明使用被动语态的形式，故D正确。

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