单选题 Up to now, the program ______ thousands of children who would otherwise have died.
A. would save B. saves
C. had saved D. has saved

【正确答案】 D
【答案解析】[解析] 本题主要考查动词的时态。up to now表示“到现在为止”，是现在完成时态的标志。因此本题选D。