—O'Neal works hard.—So he does.He is often seen heavily before his teammates have even ar

问题补充：

—ONeal 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：

A. to be sweated

B. sweated

C. be sweated

(答案→)D. sweating

解析：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。