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【題目】We will fail the exam we study hard. That's why we are trying our best to prepare for the exam.

A. untilB. whenC. unlessD. how

【答案】C

【解析】

句意：如果我們不努力學習，考試就會不及格。這就是為什么我們正在盡力準備考試（的原因）�？疾檫B詞辨析。until直到，表時間，和not連用表示“直到才”；when當?shù)臅r候，表時間；unless除非，表條件；how如何，表方式。本題表條件，需用unless連接；根據(jù)句意結構和語境，可知選C。

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