单选题 60% of those______in the research thought the noise levels of the traffic had increased.
[A] questioning [B] questioned [C] question [D] to question

【正确答案】 B
【答案解析】[精析] 本题考查的是动词过去分词的用法。根据题意，60%的被调查的人，应该用动词的过去分词形式，故B正确。