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Who__the fight against the H1N1 flu __ it not been for the c

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Who__the fight against the H1N1 flu __ it not been for the chinese scientists' great efforts?
A.could have won;had B.would win;had C.would have won;has D.would win;has
Who__the fight against the H1N1 flu __ it not been for the c
A
再问: 为什么,我读都读不懂
再答: 如果不是因为中国科学家的伟大努力,谁能在与H1N1斗争中取得胜利呢? 因为是过去发生的事情,所以是第二个空是had,对应的是could/would have won 具体参考虚拟语气,此处是 if had done ... would have done