I didn’t know that he was a cheat, or else I ________________ him.
A．should have believedB．shouldn’t believe
C．wouldn’t have believedD．couldn’t believe
C

試題分析:句意：我不知道他是一個騙子，否則我就不會相信他了。“情態(tài)動詞+v原型”用來表述現(xiàn)在或將來的事情；而“情態(tài)動詞+have done ”用來表示對過去發(fā)生事情的推測，根據(jù)前句的時態(tài)可以排除BD選項。Should have done “本應該做某事”不符合句意，此處是含蓄的虛擬語氣，答案選C。
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