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