题目内容

Bill won’t make any progress __ he studies harder than before.
A．ifB．whenC．becauseD．unless
D
考查条件状语从句的引导词的选用。句意，除非Bill比以前更加努力的学习，否则他不会取得任何进步。If如果 when当……时候 because因为 unless除非。根据题意，故选D。
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