I don’t think the experiment is failure.At least we have gained experience for future success.
A. /; the
B. a; the
C. /; /
D. a; /
网友回答
A. /; the
B. a; the
C. /; /
(答案→)D. a; /
解析:考查冠词用法。a failure 是抽象名词具体化,指具体的人或者事,此处指的是一个失败的实验。第二空experience 作经验讲,是不可数名词,作经历讲,是可数名词,此处是获得经验,所以是不可数名词。故选择D