题目内容
They found ______ very hard to work out the problem.
| A．it | B．it’s | C．this | D．that |
A
解析试题分析：句意：他们发现算出这道题非常的困难。find it +形容词+动词不定式，it代替动词不定式做形式宾语，故选A
考点：考查代词的用法。
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