问题补充:
ONeal 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
答案:
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。