They never realized the importance of the wetland ________ we told them about it．

A. if

B. until

C. so

D. because

B 【解析】句意：直到我們告訴他們，他們才意識到濕地的重要性。A. if如果，是否；B. until直到； C. so因此；D. because因為；根據(jù)not--- until--- 直到---才；They never realized the importance of the wetland 和 we told them about it．之間可知是直到我們告訴他們，他們才意識到...
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