Then Redi began to gather and record facts to find out if his hypothesis was correct. He did this by carrying on many experiment

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问题 Then Redi began to gather and record facts to find out if his hypothesis was correct. He did this by carrying on many experiments, which were designed to help him get the facts he needed.

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答案介词误用,应把on改成out。

解析 carry on的意思是“继续开展,坚持”,与句意不符,carry out意为“实行,执行”,常与experiment搭配。
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