Question

. —I’m sorry. I _________ at you the other day.
—Forget it. I was a bit out of control myself.

A．shouldn’t shout	B．shouldn’t have shouted
C．mustn’t shout	D．mustn’t have shouted

Answer 1

B。

由于must表示推测时通常不用于否定句，所以可排除C和D；再根据句中的the other day（几天前）可知，此处谈的是过去的情况，故要用“情态动词+完成式”，即答案移过B。