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选择题Up to now,the program(had saved)thousands of children who

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选择题Up to now,the program(had saved)thousands of children who would otherwise have died.
Up to now,the program______thousands of children who would otherwise have died.
C.had saved
D.has saved
正确答案C
为什么?
选择题Up to now,the program(had saved)thousands of children who
这里是虚拟语气的固定搭配.句子中:主语+had done ,主语+should/would/could/might+have done,表示与过去事实相反的情况,这个项目拯救了数千儿童,不然他们将会丧命.(事实是没丧命)