In the after-class activities，the students had plenty of and gained a lot of practical .
A. experience;experiences
B. practices;experience
C. practice;experience
D. exercise;knowledges
网友回答
A. experience;experiences
B. practices;experience
(答案→)C. practice;experience
D. exercise;knowledges
解析：practice和knowledge都是不可数名词，排除B、D两项；experience既可作可数名词“经历”，也可作不可数名词“经验”。在此应为“经验”之意，为不可数名词。