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You can go out,   you promise to be back before 10 o’clock.
A.unlessB.as long asC.becauseD.since
B

试题分析:连词辨析。A除非,如果…不;B只要;C因为;D自从,既然;句意:只要你答应10点之前回来,你可以出去玩。故B正确。
点评:连词的辨析要放在上下文中进行,要根据句子的意思进行辨析。AB项是考查重点。
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