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【题目】Some animals are in danger of dying out. Therefore, effective measures must be taken________ it is too late.

A.afterB.whenC.untilD.before

【答案】D

【解析】

句意:有些动物濒临灭绝。因此,必须及早采取有效措施。

考查时间状语从句连接词。after……之后,可以引导时间状语从句;when……时候,可以引导时间状语从句;until直到,可引导时间状语从句;before……之前,可以引导时间状语从句。根据句意,此处表示在太晚之前before符合题意。故选D

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