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【题目】What puzzles me most is why so many students bury themselves in piles of maths exercises _________they should spare some time to reflect on their previous mistakes.

A. once B. unless

C. when D. though

【答案】C

【解析】

考查连词辨析句意最让我不理解的就是为什么会有那么多的学生本该花些时间反思自己以前的错误的时候却在那里埋头于大量的数学练习题分析句子的结构可知,本句为when引导时间状语从句,表示该反思自己以前的错误的时候,前面的主语为what引导的主语从句;故选C。

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