题目

Before the sun, we need to get to the top of the mountain.A. set B. sets C. is setting D. will set 答案：【答案】B【解析】句意：太阳落山之前，我们需要到达山顶。Before 引导的时间状语从句不能用将来时态，用一般现在时态来代替，主语the sun单三，谓语动词用单数形式；故选B19、一I’m so tired after the long hours’ flight． 一A couple of hours’ sleep, ______ you will feel better，dear． A．or         B．and          C．but              D．so