Any student will be disqualified from the exam. A. catching cheatingB. catching to cheat

问题补充：

Any student will be disqualified from the exam. A. catching cheatingB. catching to cheat C. caught cheating D. caught to cheat

答案：

caught cheating 为 who is caught cheating 之省略。同时注意句型：catch sb doing sth (逮住某人做某事)。