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Ifounditdifficult.可以说成Ifoundit'sdifficult.

题目详情
I found it difficult.可以说成I found it's difficult.
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答案和解析
都可以的.
I found it difficult to solve the problem..it为形式宾语,it相当于to solve the problem.
I found it is difficult to solve the problem.it 为形式主语,found 后面省略了that.
我们可以转写为I found that to solve the prolem is difficult.
但是为了避免头重脚轻的情况,我们通常用形式主语来表达.