题目内容：

They found the article was hard ( )
A.to be understand B.to understand C.for understanding D.to have been understood

优质解答

答案：They found the article was hard 【to understand 】.

翻译：他们发现这篇文章很难理解.

解析：find it hard to do sth.翻译为发现做某事很难.

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