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---We can’t get good grades ______ we study harder.
---I agree. That’s why I study so hard.
A. because                  B. if                       C. unless
C

试题分析:because因为;if是否,如果;unless除非,如果不。句意:如果我们不努力学习我们就不能取得好成绩、——我同意这种看法。那就是我为什么这么努力学习了。结合语境可知选C。
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