_____ 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

解析試題分析:句意:如果有許多小廣告被貼在墻上,我們的城市將會(huì)不清潔。分析:考查if 引導(dǎo)的條件狀語從句,體現(xiàn)主將從現(xiàn)的原則,不潔凈的條件是墻上被貼上了小廣告。故選 C
考點(diǎn):考查連詞的用法。

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