Previously ______ at a fast food restaurant, the Smiths were dissatisfied with t
题型：不详难度：来源：
Previously ______ at a fast food restaurant, the Smiths were dissatisfied with the unhealthy meals they served there. | A．volunteered | B．to volunteer | C．volunteering | D．having volunteering |
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答案
| C |
解析
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。
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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