Question

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

Answer 1

C

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。