问题
选择题
The airplane _____late, for we didn’t see the famous pop singer until 10 pm.
A．must be
B．will be
C．would have been
D．must have been
答案
答案：D
考查虚拟语气。句意：飞机肯定是晚点了，因为我们直到下午十点钟也没有看见这位著名的歌手。“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，故选D。