问题补充:
We the difficulty together, but why didn’t you tell me?
A. should face
B. might face
C. must have faced
D. could have faced
答案:
A. should face
B. might face
C. must have faced
(答案→)D. could have faced
解析:考查虚拟语气。But后面的句子使用过去时,说明前面应该是与过去事实相反,用情态动词+have done表示与过去事实相反。