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—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

试题分析:句意:--你不应该对你妈妈大声说话的。这真的伤害了她。--确实是,我那时一定是发疯了。从shouldn’t have done说明是过去的事情,所以排除AB,must have done是对过去情况的肯定推测,could have done是“过去本可能做却没做“,不符合句意。选C。
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