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    It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.

    A．since B．before C．after D．when

    B

    解析试题分析：考查连词和句型：A. since 自从，B. before 在…前面，C. after在…后面，D. when当…时候，句意：可能还要5-10年人们才能发现月球上有个太空站。使用了句型：It may be+一段时间+before….“要…长时间才能够”，选B。
    考点：考查连词和句型

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