这条河从前是干净的but it has got polluted since the chemical plant was built．

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问题这条河从前是干净的but it has got polluted since the chemical plant was built．

选项

答案This river used to be very clean

解析表示“过去常常做……”用used to do／be sth．；而与之易混淆的词组be used to doing sth．／be sth．则表示“习惯于做某事／是某事”是说现在的事情或情况；而be used to do sth．则是表示被用来做某事。

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本试题收录于：英语题库普高专升本分类

英语

普高专升本

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这条河从前是干净的but it has got polluted since the chemical plant was built．

英语

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英语

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Haveyou【B1】______askedyourselfwhychildrengotoschool?Youwillprobablysaythattheygo【B2】______theirownlanguagea

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Historianscan’ttelluswhen,whereor【71】thefirstfoodwascooked.Inearliest【72】whenpeoplehadeatentheirfood【73】,

Becauseofherpeculiarcharacteristics,shehasalotofdifficulty______friendswithherclassmates.

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Haveyou【B1】askedyourselfwhychildrengotoschool?Youwillprobablysaythattheygo【B2】theirownlanguagea

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旱生植物中的少浆植物细胞液浓度较_，以加强根部对水分的_。