【題目】 you know little about the Qing and Ming dynasties，you'd better read more books about them.

A. Unless B. Since C. Although D. Whether

【答案】B

【解析】

句意：既然你對明清兩個朝代了解不多，你最好閱讀更多關于他們的書籍。Unless除非，如果不，引導條件狀語從句；Since自從，引導時間狀語從句；既然，引導原因狀語從句；Although盡管，引導讓步狀語從句；Whether是否，常引導名詞性從句。根據(jù)句意可知，前半句表示的是原因，故應選B。

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