The light is still on.You -------to switch it off when you left.
问题描述：
The light is still on.You -------to switch it off when you left.
A.must forget B.may forget C.must have forgotten D.might forget
答
C
有前文“灯还亮着”,可知,这是对已存在（发生）的事作以推测的
要用must have + 过去分词 这个动词形式表示对过去的事情作以肯定推测
请在客户端右上角评价点“满意”即可,