In out-of-class activities, the students had plenty of ________ and gained a lot of practical(实用的)________．

A.experience; experiences

B.practices; experience

C.practice; experience

D.exercise; knowledge

答案及解析： C

practice“锻炼”，是不可数名词；experience当“经验”讲时是不可数名词，当“经历”讲时是可数名词，在本句的意思是“经验”。故选择C项。