O'Neal works hard. He is often seen heavily before his teammates have even arrived at practice.
A. sweated
B. to be sweated
C. sweating
D. being sweated
网友回答
A. sweated
B. to be sweated
(答案→)C. sweating
D. being sweated
解析：非谓语动词的考查是本题的目的。see somebody doing表示看见某人一直正在干某事，题干中只是将主动变成了被动。