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【題目】（2017 蘇州市中考）You will never achieve success _____you devote yourself to your work.

A. after B. if C. because D. unless

【答案】D

【解析】除非你把自己專心于你的工作，否則你將永遠不會成功。

句意：after在…..之后；if如果，because因為，unless除非，如果不；if或unless引導的條件狀語從句用一般現(xiàn)在時表示一般將來時，主句用一般將來時。結合句意，你如果不專心工作，你就不會獲得成功，故此處為unless。故選D。

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