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

試題分析：句意：自從希望工程開始以來，它幫助了上百萬的孩子回到了學(xué)校上課。since后接時(shí)間點(diǎn)時(shí)，句子的謂語動詞用現(xiàn)在完成時(shí)，而且須是延續(xù)性動詞。故選A。
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