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

試題分析：本句的意思是“如果比爾不比以前更努力，他就不能取得任何進(jìn)步�！薄叭绻弧笔莍f…not或unless“除非”。所以本題選D。
點(diǎn)評(píng)：完成本題必須根據(jù)前后句的關(guān)系，來(lái)確定引導(dǎo)詞；另外，應(yīng)熟悉unless的用法。
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