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Since Project Hope started,it _______ millions of children to come back to school
A.has helped     B.helped          C.is helping
A

试题分析:句意:自从希望工程开始以来,它帮助了上百万的孩子回到了学校上课。since后接时间点时,句子的谓语动词用现在完成时,而且须是延续性动词。故选A。
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