【題目】On my way home yesterday, I saw a street cleaner ________ the rubbish carefully.
A.collecting
B.collects
C.collected
D.to collect

【答案】A
【解析】句意：昨天在回家的路上，我看見一個清潔工在小心地收集垃圾。see sb. doing sth.看見某人在做某事；see sb. do sth. 看見某人做某事�，F(xiàn)在分詞和動詞不定式都可以做賓語補足語，區(qū)別是：前者表示動作正在發(fā)生，后者表示動作發(fā)生了（即動作的全部過程結(jié)束了）。根據(jù)句意和語境，故選A。

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