The cleaners must prevent the street ______.


  1. A.
    getting dirty
  2. B.
    from dirty
  3. C.
    from get dirty
  4. D.
    from getting dirty
D
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(diǎn)：固定短語prevent sb from doing sth
點(diǎn)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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