Thestudentsputupsomesigns________theriverside________thewaterclean.[ ]A.by,tokeepB.at,tokeepC.by,keepD. in,for -初中英语-n多题

◎ 题干

The students put up some signs ________ the riverside ________ the water clean.

[ ]

A. by, to keep
B. at, to keep
C. by, keep
D. in, for

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◎ 解析

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