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(yù)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(yù)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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