In the after-class activities,the students had plenty of_________and gained a lot of practical _________A.experience;experiencesB.practices;experienceC.practice;experienceD.exercise;knowledges
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C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。