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.

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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
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