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

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

admin2007-10-09  41
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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