_____ a lot of small ads are put up on t

问题选择题

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

A．Until

B．Though

C．If

D．Unless

答案

答案：C

题目分析：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