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By the end of last month, ten primary schools _________ with the help of Project Hope.
A.had set upB.had been set up C.was set upD.set up
B

试题分析:考察时态和语态。本题的关键是by到…时为止;该词引导的时间状语与完成时连用,本题后面跟的是一般过去时。故后面的主句使用过去完成时。句意:到上个月底,在希望工程的帮助之下十所小学已经被建立了。根据句意说明使用过去完成时的被动语态。故B正确。
点评:连词by到…时为止;该词经常与完成时连用,如果后面是现在的时间,句中就使用现在完成时;如果后面是过去的时间,就使用过去完成时;如果后面是将来的时间,就使用将来完成时。
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