The cleaners must prevent the street _____.
A．from getting dirtyB．to dirty
C．to get dirtyD．getting dirty
A

試題分析：句意:清潔工們必須防止街道變臟。prevent 阻止，防止，它的句型是prevent sb. from doing sth.阻止某人做某事。根據(jù)這個句型，這里應(yīng)該用動名詞的形式，故選A。
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