Question

--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

Answer 1

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”。