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

—Andyworkshard.—Sohedoes.Heisoftenseen_____heavilybeforehisteammateshaveevenarrivedat... —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 展开
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D

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 。
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