【題目】 I _______ you, but I was too busy then.

A. will help B. helped

C. could have helped D. should have

【答案】C

【解析】

試題分析：考查含情態(tài)動詞的虛擬語氣。句意：我本來可能已經(jīng)幫助了你，但是那時(shí)我太忙。Could have done表示可能已經(jīng)做了某事，故選C。

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