【題目】You’ll not make any progress ______ you get rid of your bad habit of study.

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

【答案】D

【解析】句意：除非你改掉學習的壞習慣，否則你不會有任何進步。A. because因為；B. after在…之后；C. if假如；D. unless除非。根據(jù)句意，可知這里是由unless引導的條件狀語從句，含有否定意義，相當于if引導條件狀語從句的否定形式，所以unless=if not，故答案選D。

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