选C项 it做形式宾语,代替的是后面的to hold the same position.证据的意思就是：(调查表明）人们发现在一段时间里保持同一种姿势是非常不舒服的.
It has been shown that many people find _____ very uncomfort
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1.It has been shown that many people find ______very uncomfo
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