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。