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【題目】Our government has promised to improve our water quality, so it won’t be long _______ the residents can have access to clean water.

A. after B. since C. before D. unless

【答案】C

【解析】

試題分析：考查固定搭配。句意：我國政府已經承諾提高我們的水質，因此用不了多

長時間居民就可以獲得清潔的水了。固定句型it won’t be long before…意為做什么不

用花很長時間（事情未發(fā)生）。故選C。

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