题目

The teacher ___ the students not to ___ quickly when answering questions. A. told, say   B. said, talk    C. asked, speak    D. spoke to, tell 答案：C 解析: ask sb. to do sth.意为:要求某人做某事; speak意思是:讲.Will you please keep quiet now? You shouldn’t talk until ______ to.A.askingB.having askedC.to askD.asked