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    精英家教网 > 高中英语 > 题目详情

    【题目】In our class，when the bell rang and the teacher closed his book，it was a ________for everyone to stand up.

    A．signal

    B．chance

    C．mark

    D．measure

    【答案】A

    【解析】A项意为“信号”；B项意为“机会”；C项意为“记号”；D项意为“措施”。句中it代替“铃响时教师合上书”这件事，而它正是大家要起立的“信号”。

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