10.In most parts of the world human problems_________(study) at that time.

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10.In most parts of the world human problems_________(study) at that time.
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10.In most parts of the world human problems_________(study) at that time.
10.In most parts of the world human problems_________(study) at that time.

10.In most parts of the world human problems_________(study) at that time.
In most parts of the world human problems (were studied)at that time.
“在大部分地区,人类的问题都是在那个时候被研究的.”
如果括号里是(not study),才可以选择否定式.
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weren't studied/hadn't been studied
在那个时候,世界上大多数地区还未涉及人类问题的研究。

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were studied

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