Up to now, the program ________ thousands of children who would otherwise have died.

题目：Up to now, the program ________ thousands of children who would otherwise have died.

A. would save
B. saves
C. had saved
D. has saved

喵查答案：D

本题考查动词时态的用法。句意应为“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。