We don’t think the experiment is failure. At least we have gained experience for future success.
A. the; a
B. a; /
C. a; an
D. the; the
网友回答
A. the; a
(答案→)B. a; /
C. a; an
D. the; the
解析：考查冠词，the是定冠词；a/an不定冠词，a failure表示一次失败，experience意思“经验”，是不可数名词，不加冠词；做经历讲时，是个可数名词，所以选B