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    How long do you think it will be ______ the Chinese people land on the moon?
    A．thatB．sinceC．untilD．before
    D
    考查连词，since 自从，until 直到，before 在什么之前，才，就，句意：你认为再过多久中国人民才能登上月球呢？所以选D。
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