1. _______that a storm was coming, the captain changed the course.
A.having been warned B.to be warned
C.having warned D.warning
2.Unless _________to speak ,you should remain silent at the meeting.
A invited B inviting
C being invited D having invited
3. -What did he say?
-He side he _____to the station to see you off.
A is going B would go C was going
4.-When are you leaving for Shanghai?
-My plane _________at 11:30.
A will take off B is about to take off
C takes off D are going to take off
A is going B would go C was going
答案是AACC
为什么？
參考答案:第一题：主句的主语是the captain，由此可知，应该是the captain被警告有暴风雨，所以排除了C、D，因为这两项都不是被动语态。主句的时态是一般过去时，所以应当用过去完成时表示从句的动作是在主句的动作完成前做的！
第二题：主要解释同第一题！主语是you，因此还是被动语态，被邀请，排除B、D。C项不对是因为它是正在被邀请，显然不对！在会议上的发言，多数会在提前被邀请！
第三题：由时态排除A,be going to do是指的打算去做！
第四题：这个需要一些经验了！一般情况下，飞机起飞的时刻，每天是一样的！一般现在时就是指每天重复发生或做的事！