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【题目】 I find it difficult to learn Physics well.

That’s true. Nobody can learn it well _______ he works hard at it.

A. if B. because C. unless

【答案】C

【解析】

试题分析:句意:---我发现很难学好物理。——这是真的。没有人能学好它除非他刻苦学习。A. if如果是否;B. because因为;C. unless除非,如果不。结合句意可知选C。

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