组卷网 > 高中英语综合库 > 语法 > 词法 > 冠词 > 不定冠词
题型:单项选择 难度:0.65 引用次数:508 题号:1762745
I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests.
A.不填; 不填B.不填; a
C.a; aD.a; 不填
2010·四川资阳·二模 查看更多[3]

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