【题目】We the difficulty together, but why didn't you tell me?
A. could face
B. might face
C. could have faced
D. must have faced
在线课程【答案】C
【解析】could have done的格式是表示对过去的推测 从 why didn't you tell me看出，这正是对过去的推测 而might还是对现在的推测，虽然用过去式的样子，但是不是过去式，只是语气的委婉.
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