we must do everything we can ( ) waste water from running into the rivers.A.keep B.kept C.to keep D.keeping要说明理由,

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wemustdoeverythingwecan()wastewaterfromrunningintotherivers.A.keepB.keptC.tokeepD.keeping要说明理由,wemus

we must do everything we can ( ) waste water from running into the rivers.A.keep B.kept C.to keep D.keeping要说明理由,
we must do everything we can ( ) waste water from running into the rivers.
A.keep B.kept C.to keep D.keeping
要说明理由,

we must do everything we can ( ) waste water from running into the rivers.A.keep B.kept C.to keep D.keeping要说明理由,
很显然是 C 啦 to keep 表目的状语啦
我们必须做我们能为能够做的一切 来防止水土流失
“防止水土流失”是目的啦

c

C 动词不定式作目的状语( 为了防止污水流入河流,我们必须做我们所能做的一切)

a