You can go out,   you promise to be back before 10 o’clock.
A．unlessB．a(chǎn)s long asC．becauseD．since
B

試題分析：連詞辨析。A除非，如果…不；B只要；C因為；D自從，既然；句意：只要你答應10點之前回來，你可以出去玩。故B正確。
點評：連詞的辨析要放在上下文中進行，要根據(jù)句子的意思進行辨析。AB項是考查重點。
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