题目

— 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：D 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。

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