Previously ______ at a fast food restaurant, the Smiths were dissatisfied with the unhealthy meals they served there.
A．volunteeredB．to volunteerC．volunteeringD．having volunteering
C

試題分析：考查分詞做狀語(yǔ)。當(dāng)分詞做狀語(yǔ)時(shí)，動(dòng)詞與后面句子的主語(yǔ)構(gòu)成主動(dòng)關(guān)系，就使用現(xiàn)在分詞的形式；當(dāng)二者構(gòu)成被動(dòng)關(guān)系的時(shí)候就使用過去分詞；本題的volunteer與句子主語(yǔ)the Smiths構(gòu)成主動(dòng)關(guān)系，故使用現(xiàn)在分詞的形式。B項(xiàng)不定式表示未來。D項(xiàng)表示動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞之前。故C正確。
點(diǎn)評(píng)：當(dāng)分詞做狀語(yǔ)時(shí)，動(dòng)詞與后面句子的主語(yǔ)構(gòu)成主動(dòng)關(guān)系，就使用現(xiàn)在分詞的形式；當(dāng)二者構(gòu)成被動(dòng)關(guān)系的時(shí)候就使用過去分詞；
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