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

A.ifB.afterC.unlessD.when

【答案】C

【解析】

句意:知識(shí)會(huì)被遺忘如果我們不使用它。

A. if如果,引導(dǎo)條件狀語(yǔ)從句;B. after在……之后,引導(dǎo)時(shí)間狀語(yǔ)從句;C. unless除非,引導(dǎo)條件狀語(yǔ)從句,相當(dāng)于if not;D. when當(dāng)……時(shí),引導(dǎo)時(shí)間狀語(yǔ)從句!爸R(shí)會(huì)被遺忘”的條件是“如果我們不使用它”。故選C

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