We will have no water to drink _________ we don’t protect the earth.
A. until                    B. if                       C. unless

B

解析試題分析：A. until直到，B. if如果，C. unless除非，句意：如果我們不保護(hù)地球，我們將沒(méi)有水喝。if引導(dǎo)的條件狀語(yǔ)從句用一般現(xiàn)在時(shí)，主句用一般將來(lái)時(shí)。故選B。
考點(diǎn)：考查條件狀語(yǔ)從句的用法。

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