问题
单项选择题
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
参考答案：D
解析： 本题考查动词时态的用法。up to now是现在完成时的标志，所以空格处使用现在完成时。
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