You’ll fail the exam _____ you work hard. 

A.ifB.unlessC.orD.so

B

解析試題分析:句意:除非你努力學習,不然你考試會失敗。A如果;B除非;C不然,或者;D所以,結(jié)合語境選B。
考點:考查連詞。

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