How long do you believe it will be _____ Chinese people land on the moon?
A．beforeB．sinceC．whenD．that
A
考查連詞的用法，before 在什么之前，才，就，since 自從，when 當什么時候，句意：你認為還要多久中國人才能在月球上著陸。所以選A。
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