—O'Neal works hard. —So he does.He is of

问题选择题

—O'Neal works hard.

—So he does.He is often seen ________ heavily before his teammates have even arrived at practice.

A．to be sweated

B．sweated

C．be sweated

D．sweating

答案

答案：D

根据句子结构可知，感觉动词see用于被动结构，选项A、C不可以用于这一结构中；选项B为被动意义、不成立；只有选项D(sweating)现在分词与be seen构成复合结构，强调状态。