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

A.ifB.afterC.unlessD.when

【答案】C

【解析】

句意:知識會被遺忘如果我們不使用它。

A. if如果,引導(dǎo)條件狀語從句;B. after在……之后,引導(dǎo)時(shí)間狀語從句;C. unless除非,引導(dǎo)條件狀語從句,相當(dāng)于if notD. when當(dāng)……時(shí),引導(dǎo)時(shí)間狀語從句!爸R會被遺忘”的條件是“如果我們不使用它”。故選C。

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