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重点句型归纳1.—Theriverwasdirty.(甚至河底都充满了垃圾。)—Butitusedtobesoclean.

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重点句型归纳

1. —The river was dirty.                (甚至河底都充满了垃圾。)

—But it used to be so clean.

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重点句型归纳1. Even the bottom of the river was full of rubbish.
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