【正确答案】 B

【答案解析】[解析] 题意：都快5点钟了，该下班了。
划线词的意为“停止”。
A项意为“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。
B项意为“停止”，例：The train stopped at the station. 火车在车站停了下来。
C，项意为“继续”，例：He continued his writing for another year. 他又继续写了一年。
D项意为“保持，阻止”，例：Robbie couldn"t keep the child from yelling. 罗比没法使孩子不大叫大嚷。故选B。