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【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,前后句為從屬關系,前句是后句的原因,因為信得內容是保密的,所以必須保證安全性,故用引導原因狀語從句的從屬連詞。故選B項。

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