单选题
We have to ask them to quit talking in order that all people present could hear us clearly.
【正确答案】
B
【答案解析】[解析] 四个选项都可以跟动名词结构：quit doing.=cease doing．停止……；begin doing开始……； continue doing继续……；keep doing一直……。该句的含义是“为了让所有在场的人都能清楚地听见我们的声音，我们不得不让他们停止讲话。”