—You shouldn’t have shouted at your mother. It really hurt her.
—Exactly. I ________ crazy at the time.

A．must beB．could be C．must have beenD．could have been

C

解析試題分析：句意：--你不應(yīng)該對你媽媽大聲說話的。這真的傷害了她。--確實(shí)是，我那時一定是發(fā)瘋了。從shouldn’t have done說明是過去的事情，所以排除AB，must have done是對過去情況的肯定推測，could have done是“過去本可能做卻沒做“，不符合句意。選C。
考點(diǎn)：考查情態(tài)動詞的完成式

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