－When shall we set off?
－We start off at five o’clock if it raining by then.
A. will; has stopped
B. are about to; stops
C. are going to; will stop
D. are to; will stop
网友回答
(答案→)A. will; has stopped
B. are about to; stops
C. are going to; will stop
D. are to; will stop
解析：句意：---我们什么时候出发？---假如五点钟停了雨的话我们就在那时出发。第一空有时间状语at five o’clock属于将来的时间，用一般将来时，选项中的几种都可表将来；关键是第二空，意思是到五点钟时已经停了雨，将来的某个时间已经发生某事要用将来完成时，但由于是在if引导的条件状语从句中，那就要用现在完成时表将来完成时，所以选C。