根据句子结构和句意用所给单词的适当形式填空.They are said _(find)out a simpler method for producing plastics.

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根据句子结构和句意用所给单词的适当形式填空.They are said _(find)out a simpler method for producing plastics.
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根据句子结构和句意用所给单词的适当形式填空.They are said _(find)out a simpler method for producing plastics.
根据句子结构和句意用所给单词的适当形式填空.
They are said _(find)out a simpler method for producing plastics.

根据句子结构和句意用所给单词的适当形式填空.They are said _(find)out a simpler method for producing plastics.
准确答案应该是:to have found
解释:不定式短语to find out...所表示的动作发生在谓语动词are said之前,所以使用其完成形式to have done sth,所以答案是to have found...

to find
固定搭配be said to do sth.