问题
选择题
Up to now，the program________thousands of children who would otherwise have died.
A．would save
B．saves
C．had saved
D．has saved
答案
答案：D
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。
