—Andy works hard—So he does．He is often seen heavily before his teammates have even arri

问题补充：

—Andy 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：考查短语 see sb doing 看到某人正在做某事，此句是被看见正在做某事，应是：sb is seen doing 所以选D 。