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【题目】Knowledge will be forgotten ________ we use it.

A.ifB.afterC.unlessD.when

【答案】C

【解析】

句意:知识会被遗忘如果我们不使用它。

A. if如果,引导条件状语从句;B. after在……之后,引导时间状语从句;C. unless除非,引导条件状语从句,相当于if notD. when当……时,引导时间状语从句。“知识会被遗忘”的条件是“如果我们不使用它”。故选C

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