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Bill won’t make any progress ______ he studies harder than before .
A.ifB.whenC.becauseD.unless
D

试题分析:本句的意思是“如果比尔不比以前更努力,他就不能取得任何进步。”“如果……不”是if…not或unless“除非”。所以本题选D。
点评:完成本题必须根据前后句的关系,来确定引导词;另外,应熟悉unless的用法。
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