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The cleaners must prevent the street ______.

A.getting dirtyB.from dirtyC.from get dirtyD.from getting dirty

D

解析試題分析:prevent sb from doing sth預防,阻止某人干某事,from是介詞后面接名詞或者動名詞。故選D,清潔工必須防止大街變臟。
考點:固定短語prevent sb from doing sth
點評:prevent sb from doing sth預防,阻止某人干某事,from是介詞后面接名詞或者動名詞。

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