一道同义句转换(初二英语)We ought to do something to keep the rivers clean.____ ____ ____ ____ ____ to keep the rivers clean.

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一道同义句转换(初二英语)We ought to do something to keep the rivers clean.____ ____ ____ ____ ____ to keep the rivers clean.
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一道同义句转换(初二英语)We ought to do something to keep the rivers clean.____ ____ ____ ____ ____ to keep the rivers clean.
一道同义句转换(初二英语)
We ought to do something to keep the rivers clean.
____ ____ ____ ____ ____ to keep the rivers clean.

一道同义句转换(初二英语)We ought to do something to keep the rivers clean.____ ____ ____ ____ ____ to keep the rivers clean.
we should have done something to keep the rivers clean .我们本该做些事去保持河水清洁.should have done sth= ought to 本该做某事而没去做.