问题补充：
—The room is in a mess again!
——Sorry. It is who .
A. me, is to blame
B. I, is to be blamed
C. me, am to be blamed
D. I, am to blame
答案：
A. me, is to blame
B. I, is to be blamed
C. me, am to be blamed
(答案→)D. I, am to blame
解析：考查强调句型。“房间又乱了！”“对不起，应该责罚我”。 强调主语用人称代词的主格形式，“应受责备”be to blam，所以选D
