Bill won’t make any progress ______ he studies harder than before . A．ifB．whenC．
题型：不详难度：来源：
Bill won’t make any progress ______ he studies harder than before . | A．if | B．when | C．because | D．unless |
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答案
| D |
解析
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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A. since B. for C. when |
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