【題目】______ 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】

考查從屬連詞辨析。句意：因為這封信的內(nèi)容是保密的，安全性是您必須解決的問題。A. Although盡管；B. Since因為；C. Unless除非；D. After在……之后。分析句子可知，前后句為從屬關(guān)系，前句是后句的原因，因為信得內(nèi)容是保密的，所以必須保證安全性，故用引導(dǎo)原因狀語從句的從屬連詞。故選B項。

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