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 。