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    【题目】__________ many students have known about the news, you, as our monitor, had better announce it officially in front of all the students.

    A. Unless

    B. Although

    C. Once

    D. Because

    【答案】B

    【解析】句意:尽管许多学生知道这个消息，你作为班长，最好在所有学生面前正式宣布。although引导让步状语从句，“尽管”，unless“ 除非”，once“一旦”，because“因为”。

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