—Why are you looking so disappointed, Ken?
—The outdoor concert for tomorrow will be put off.
A. planned
B. planning
C. to plan
D. to be planned
网友回答
(答案→)A. planned
B. planning
C. to plan
D. to be planned
解析：本题考查非谓语动词的用法。过去分词短语作后置定语表示动作的完成，且表示被动。