---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

解析試題分析：because因?yàn)�；if是否，如果；unless除非，如果不。句意：如果我們不努力學(xué)習(xí)我們就不能取得好成績(jī)、——我同意這種看法。那就是我為什么這么努力學(xué)習(xí)了。結(jié)合語(yǔ)境可知選C。
考點(diǎn)：考查連詞辨析

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