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(dòng)詞。 could have done意為“本可以做某事（而實(shí)際上沒做）”故選C。句意：我們本可以一起面對(duì)困難，但你為什么不告訴我。

考點(diǎn)：考查情態(tài)動(dòng)詞及語(yǔ)境理解

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