【題目】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】

試題分析：句意：只要你答應(yīng)10點(diǎn)前回來(lái)，你就可以外出。Unless除非，如果…不…；as long as只要；根據(jù)句意可知B正確。

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