---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

試題分析：because因為；if是否，如果；unless除非，如果不。句意：如果我們不努力學習我們就不能取得好成績、——我同意這種看法。那就是我為什么這么努力學習了。結(jié)合語境可知選C。
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