—I won't get good grades_______ I study ...

—I won't get good grades_______ I study hard.

—That's ______ everyone is trying his best to prepare for the exam.

A. until; why B. unless; when C. unless; why

C 【解析】试题分析：句意：--如果我不努力学校，那么我就不能获得好成绩。--这就是为什么每一个人都在为考试尽最大努力做准备。A. until直到; why为什么；B. unless如果不; when什么时间；C. unless如果不；why为什么。根据句意，故选C。【考点定位】考查连词。

考点分析：

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