问题补充：
He was at the waste of food in the school.
A. shocked; shocked
B. shocking; shocked
C. shocking; shocking
D. shocked; shocking
答案：
A. shocked; shocked
B. shocking; shocked
C. shocking; shocking
(答案→)D. shocked; shocking
解析：这题考查形容词的用法：shocked修饰人“感到震惊的”，shocking修饰物“令人震惊的”，句意是：他对学校令人震惊的食物垃圾感到 震惊。选D。
