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Unless _________ by the police, you should keep silent over the accident.


  1. A.
    asked
  2. B.
    ask
  3. C.
    being asked
  4. D.
    having asked
A
試題分析：從by the police可以說明you與ask之間構成被動關系，故排除ＢＤ，另外非謂語動詞的省略往往會省略從句的主語和部分謂語，即be動詞，故選答案Ａ，也可以將狀語從句補全，即Unless you  are asked by the police,然后再去掉you are,即可得知答案。
考點：考查非謂語動詞的省略。
點評：狀語從句的省略同時具備下列兩個條件:①主句和從句的主語一致，或從句主語為it；②從句主要動詞是be的某種形式。從句中的主語和be動詞常可省略
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