Alan and his friends used to go to the City park and _________ s

Alan and his friends used to go to the City park and _________ singing after school.
A、train
B、practice
C、drill
D、operate
【正确答案】：B
【题目解析】：practice的意思是“练习”。原句的意思是“Alan和他的朋友们过去常常放学后到城市公园练习唱歌”。因此我们选择B. practice。