【題目】They will fail the exam_______they try their best.

A．unless B．once C．since D．a(chǎn)fter

【答案】A

【解析】分析語境“他們會(huì)考試失利”以及“他們盡最大的努力”，可知這是一個(gè)條件狀語從句，unless意為“除非……”符合語境。

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