—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
考查短語 see sb doing 看到某人正在做某事，此句是被看見正在做某事，應(yīng)是：sb is seen doing 所以選D 。
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