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Up to now, the program ______ thousands of children who would otherwise have died.
A.would saveB.savesC.had savedD.has saved
D

这题考查时态,时间是:Up to now“直到现在”所以用现在完成时,句意是:直到现在,这个项目挽救了上千名儿童的命,否则他们就会死掉。选D。
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