Up to now，the program thousands of children who would otherwise have died.
A. would save
B. saves
C. had saved
D. has saved
网友回答
A. would save
B. saves
C. had saved
(答案→)D. has saved
解析：
句意为：截止到现在，这个项目已经挽救了成千上万的本来会死去的孩子的生命。up to now是现在完成时态的标志，所以空格处使用现在完成时态。