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（） all the respondents, 67.1% were married and 32.9% were single.
（） all the respondents, 67.1% were married and 32.9% were single.
正确答案：of
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英文科技论文写作
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About 4.2% of the 1,120 respondents were younger than 20 years, and 26.7% were （） 21 and 30 years old.
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