问题
选择题
--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
答案
答案：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”。