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You must learn to consider all possible results        you begin to carry out your plan.

A.although B.before C.because D.unless 

B

解析试题分析:考察连词辨析。A尽管;B在…之前;C因为;D除非,如果不…;句意:你一定要学会在你开始执行计划之前,就考虑所有可能的结果。故B正确。
考点:考察连词辨析

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