【题目】It is dangerous to drive the car while on the phone.
A.talkB.talkingC.talkedD.to talk
在线课程【答案】B
【解析】
考查省略句。句意：一边开车一边打电话是很危险的。主句为it做形式主语，句型it be+ adj.+(for sb.) to do sth.，省略了for you；从句为while引导的省略句，省略了主语和谓语动词，完整为while (you are) talking on the phone。故选B。