This experiment turned out to be___failure,but,as we know,su

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This experiment turned out to be___failure,but,as we know,success often comes after__failure.
A a;a B 不填；不填 C a;不填 D 不填;a 选C,为什么呢?

C
这次试验结果发现失败了,但是,据我们所知,失败是成功之母.
failure 在表示“失败”时,是抽象名词,不可数.
在表示“失败的人或事”时,被具体化了,是可数名词.
第一个空特指这次试验是一次失败,取上述failure第二个意思,所以填不定冠词a,表示“一次”.
第二个空是和主语“成功”相对,表示失败这个抽象的概念,形式上应该和success一样.所以不填.

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