You must learn to consider all possible results        you begin to carry out your plan.
A．a(chǎn)lthoughB．beforeC．becauseD．unless
B

試題分析：考察連詞辨析。A盡管；B在…之前；C因為；D除非，如果不…；句意：你一定要學(xué)會在你開始執(zhí)行計劃之前，就考慮所有可能的結(jié)果。故B正確。
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