Question

【题目】When you ____ the classroom, please turn off the lights.

A. leftB. are leavingC. leaveD. leaves

Answer 1

【答案】C

【解析】

句意：当你离开教室时，请把灯关掉。考查动词时态辨析。本句是时间状语从句，when相当于if，表条件，时态遵循主将从现；you是第二人称，动词需用原形；根据句意语境，可知选C。