【题目】Roger trained hard for the tournament for months, but unfortunately he had to _______ due to a knee injury.
A. pull out B. work out
C. try out D. give out
在线课程【答案】A
【解析】考查动词短语辨析。句意：Roger为了锦标赛努力训练了几个月，但是不幸的是，因为膝盖受伤，他不得不退出（比赛）。pull out退出。work out算出，解决；try out试验；give out分发，散发。A项符合语境。