--I'm told that John had another car accident this morning.
--I believe not. He _________so careless.
A. shouldn't have been B. wouldn't have been
C. couldn't have been D. mustn't have been
--I'm told that John had another car accident this morning.
--I believe not. He _________so careless.
A. shouldn't have been B. wouldn't have been
C. couldn't have been D. 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”。