【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?yàn)檫@封信的內(nèi)容是保密的，安全性是您必須解決的問(wèn)題。A. Although盡管；B. Since因?yàn)椋?/span>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?yàn)樾诺脙?nèi)容是保密的，所以必須保證安全性，故用引導(dǎo)原因狀語(yǔ)從句的從屬連詞。故選B項(xiàng)。

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