We usually design a s____ to find out people's opinions on something.横线上填什么?

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We usually design a s____ to find out people's opinions on something.横线上填什么?
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We usually design a s____ to find out people's opinions on something.横线上填什么?
We usually design a s____ to find out people's opinions on something.横线上填什么?

We usually design a s____ to find out people's opinions on something.横线上填什么?
survey 问卷调查