It is greatpitythat the discovery of flight MH 370 still proves to be failure.A. 不填；aB.

It is great pity that the discovery of flight MH 370 still proves to be failure.
A. 不填；a
B. the; the
C. a; a
D. a；不填

A. 不填；aB. the; the(答案→)C. a; aD. a；不填解析：句意：马航MH370航班的搜索证明是失败的这真是遗憾的事情。第一空填a，pity这里是抽象名词具体化，第二空题a，这里的failure也是抽象名词具体化，所以选C。

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