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Previously ______ at a fast food restaurant, the Smiths were dissatisfied with the unhealthy meals they served there.


  1. A.
    volunteered
  2. B.
    to volunteer
  3. C.
    volunteering
  4. D.
    having volunteering
C
试题分析:考查分词做状语。当分词做状语时,动词与后面句子的主语构成主动关系,就使用现在分词的形式;当二者构成被动关系的时候就使用过去分词;本题的volunteer与句子主语the Smiths构成主动关系,故使用现在分词的形式。B项不定式表示未来。D项表示动作发生在谓语动词之前。故C正确。
考点:考查分词做状语。
点评:当分词做状语时,动词与后面句子的主语构成主动关系,就使用现在分词的形式;当二者构成被动关系的时候就使用过去分词;
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