---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 beenC.couldn't have beenD.mustn't have been
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C解析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”。