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    精英家教网 > 高中英语 > 题目详情
    单项选择（每题1分）
    We must think twice _____ we make the final decision.
    A．whenB．whileC．untilD．before
    D
    连词辨析。When当……时 ；while一边……一边；强调动作同时进行；until直到，常和not连用；before在……之前。句意：在我们做最后决定之前，我们必须思考两次。（必须三思而后行）。结合语境可知选D。
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