Up to now, the program ______ thousands of children who would otherwise have died.
A．would saveB．savesC．had savedD．has saved
D

這題考查時(shí)態(tài)，時(shí)間是：Up to now“直到現(xiàn)在”所以用現(xiàn)在完成時(shí)，句意是：直到現(xiàn)在，這個(gè)項(xiàng)目挽救了上千名兒童的命，否則他們就會(huì)死掉。選D。
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