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_____ a lot of small ads are put up on the walls, out city will be untidy.

A.Until B.Though C.If D.Unless

C

解析试题分析:句意:如果有许多小广告被贴在墙上,我们的城市将会不清洁。分析:考查if 引导的条件状语从句,体现主将从现的原则,不洁净的条件是墙上被贴上了小广告。故选 C
考点:考查连词的用法。

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