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【题目】Sam won’t make any progress ______ he studies harder than before.

A.ifB.whenC.becauseD.unless

【答案】D

【解析】

句意:Sam不会取得任何进步,除非他比之前更努力的学习。

考查连词辨析。if如果;when……时;because因为;unless除非。结合上下句的含义可知此句是unless引导的条件状语从句。故选D

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