问题补充：
The teacher called Tom to his office because he was caught in the exam.
A. to cheat
B. cheating
C. cheated
D. cheat
答案：
A. to cheat
(答案→)B. cheating
C. cheated
D. cheat
解析：句意：因为汤姆被发现在考试中作弊，所以老师把他叫到办公室。catch sb. doing sth.(be caught doing). 为固定用法，意为：抓住/逮住某人在做某事(常常指做不好的事被人抓/逮住)。
