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    【题目】You can go out, ______ you promise to be back before 10 o’clock.

    A. unless B. as long as C. because D. since

    【答案】B

    【解析】

    试题分析：句意：只要你答应10点前回来，你就可以外出。Unless除非，如果…不…；as long as只要；根据句意可知B正确。

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