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--I'm told that John had another car accident this morning.
--I believe not. He  _________so careless.
A.shouldn't have beenB.wouldn't have been
C.couldn't have beenD.mustn't have been
C
本题考查时态的掌握情况,问句是“有人告诉我约翰今天早晨出了交通事故”,答句应为“我不相信,他不可能这么不小心。”只有c项为此意思,shouldn't have done表示“本来不应该……”,mustn't have done表示“禁止做”。
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