【題目】—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

【答案】C

【解析】

試題分析：句意：--如果我不努力學(xué)校，那么我就不能獲得好成績。--這就是為什么每一個(gè)人都在為考試盡最大努力做準(zhǔn)備。A. until直到; why為什么；B. unless如果不; when什么時(shí)間；C. unless如果不；why為什么。根據(jù)句意，故選C。

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