—O'Neal works hard.
—So he does.He is often seen ________ heavily before his teammates have even arrived at practice.
A．to be sweatedB．sweated
C．be sweatedD．sweating
D
根據(jù)句子結(jié)構(gòu)可知，感覺動詞see用于被動結(jié)構(gòu)，選項(xiàng)A、C不可以用于這一結(jié)構(gòu)中；選項(xiàng)B為被動意義、不成立；只有選項(xiàng)D(sweating)現(xiàn)在分詞與be seen構(gòu)成復(fù)合結(jié)構(gòu)，強(qiáng)調(diào)狀態(tài)。
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