Mr.Black got his head hurt.So he found _______ very difficult to get to sleep

Mr.Black got his head hurt.So he found _______ very difficult to get to sleep

题目
Mr.Black got his head hurt.So he found _______ very difficult to get to sleep
A、it B、that C、this D、those
答案
A it
用形式主语 it + 形容词+ to do 的结构
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