Market research is usually very ______, involving thousands of people answering

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问题 Market research is usually very ______, involving thousands of people answering hundreds of questions.

选项 A、detailed
B、details
C、detail
D、detailing

答案 A

解析本题考查词形的变化。考查的词根detail是名词，意为“细节”，可用复数；加-ed变形容词，意为“详细的”；没有加-ing变形容词的用法。

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