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:

非謂語動詞的考查是本題的目的。see somebody doing表示看見某人一直正在干某事，題干中只是將主動變成了被動。