【答案解析】[解析] 画线词quit为动词，意为“停止”，B项stop意为“停止”．与画线词意思相近；例：The train stopped at the station.火车在车站停了下来。A项increase意为“增加”；例：The workers are trying their best to increase productivity.工人们正竭尽全力提高生产力。C项continue意为“继续”；例：He continued his writing for another year.他又继续写了一年。D项keep意为“保持，阻止”；例：Robbie couldn"t keep the child from yelling.罗比没法使这个孩子不大叫大嚷。