【題目】I saw a street cleaner __________ the street when I went to school this morning.
A.clean
B.cleaning
C.to clean

【答案】B
【解析】句意:今天早上當(dāng)我上學(xué)時,我看見一名街道清潔工在掃大街。根據(jù)短語see sb doing sth看見某人正在做某事,故此處用現(xiàn)在分詞cleaning。故選B。

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