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

C

【解析】

試題分析：考查情態(tài)動詞辨析。句意：我們本可以一起面對困難的，但是你沒有告訴我。根據(jù)句意說明是對過去事實相反的虛擬語氣，故使用“情態(tài)動詞+have done”；could have done本可以做某事，實際上卻未做；must have done一定做了某事；故C正確。

考點：考查情態(tài)動詞用法

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