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—Andy works hard.
—So he does.He is often seen _____ heavily before his teammates have even arrived at practice.
A.to be sweatedB.sweatedC.be sweatedD.sweating
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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