Experts are trying to work out a plan to deal with the problems caused by global warming _________ it is too late.
A．ifB．before C．whenD．until
B
考查連詞用法。Before在…之前；在不同句子中的翻譯比較靈活。句意：專家正在努力的制定一個在情況變得嚴重之前來處理由全球變暖導致的問題的計劃。
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