【题目】We the difficulty together, but why didn’t you tell me?
A. should face B. might face
C. could have face D. must have faced
在线课程【答案】C
【解析】试题分析：考查情态动词。本题考查对过去事情推测，故用情态动词 + have done，could have done本可以做，must have done过去一定做。句意：我们本可以一起克服困难的，但你为什么不告诉我呢？故C正确。