The methods of spectrum analysis vary according to the wavelength region were studied.

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问题 The methods of spectrum analysis vary according to the wavelength region were studied.

选项

答案were一去掉were

解析译文：分析光谱的办法是根据所研究的波长范围不同而变化的。
分析：考查过去分词。过去分词studied作后置定语修饰region，其作用相当于定语从句省去which／that及系动词。此句系动词用错，应该是was才对，所以不能直接加which／that，而是把were删掉。

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专业英语八级

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