问题
选择题
I was really anxious about you. You _______ home without a word．
A．mustn’t leave
B．shouldn’t have left
C．couldn’t have left
D．needn’t leave
答案
答案：B
本题考查should have done 的用法。should have done只用于谈论过去情况，指本该发生而实际上未发生的情况。shouldn’t have done表示＂本来不应该做某事，而实际做了”。含有指责对方或自责的含意；couldn't have done 只表推测,相当于 can't have done意为:“过去不可能做了某事.”。