问题
选择题
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
答案
C
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。