问题补充：
The man over there was injured in a car accident yesterday.
A. operate on
B. being operated on
C. to operate on
D. being operated
答案：
A. operate on
(答案→)B. being operated on
C. to operate on
D. being operated
解析：这题考查词组：operate on sb“给某人做手术”，用现在分词的被动式做定语，表示正在做手术的人，句意是：正在那边做手术的人昨天在车祸中受伤了。选B。
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