[题目] the content of this letter can be confidential; security is an issue that you must address.A.AlthoughB.SinceC.UnlessD.After 题目和参考答案——青夏教育精英家教网—

【题目】______ the content of this letter can be confidential; security is an issue that you must address.

A.AlthoughB.SinceC.UnlessD.After

【答案】B

【解析】

考查从属连词辨析。句意：因为这封信的内容是保密的，安全性是您必须解决的问题。A. Although尽管；B. Since因为；C. Unless除非；D. After在……之后。分析句子可知，前后句为从属关系，前句是后句的原因，因为信得内容是保密的，所以必须保证安全性，故用引导原因状语从句的从属连词。故选B项。

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