Question

【题目】We'd better ________off our mobile phones. The meeting will start in a minute.

A. to turn B. turning C. turn D. turned

Answer 1

【答案】C

【解析】句意: 我们最好关掉手机。会议马上就要开始了。turn off关掉。根据“had better+动词原形”，最好做某事，所以本题使用动词原形turn。故选：C。