【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(duì)明清兩個(gè)朝代了解不多，你最好閱讀更多關(guān)于他們的書(shū)籍。Unless除非，如果不，引導(dǎo)條件狀語(yǔ)從句；Since自從，引導(dǎo)時(shí)間狀語(yǔ)從句；既然，引導(dǎo)原因狀語(yǔ)從句；Although盡管，引導(dǎo)讓步狀語(yǔ)從句；Whether是否，常引導(dǎo)名詞性從句。根據(jù)句意可知，前半句表示的是原因，故應(yīng)選B。

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