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10.In most parts of the world human problems_________(study) at that time.
人气:468 ℃ 时间:2020-03-21 14:08:55
解答
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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