问题补充:
We the difficulty together, but why didn’t you tell me?
A. should face
B. might face
C. could have faced
D. must have faced
答案:
A. should face
B. might face
(答案→)C. could have faced
D. must have faced
解析:考察虚拟语气。根据but后面的过去时可知是与过去事实相反,那么主句中应该使用情态动词+have done的形式。故排除AB。D项只表示对过去情况的肯定推测,不表示虚拟,故C正确。