How long do you think it will be ______ the Chinese people land on the moon?
A．thatB．sinceC．untilD．before
D
考查連詞，since 自從，until 直到，before 在什么之前，才，就，句意：你認(rèn)為再過(guò)多久中國(guó)人民才能登上月球呢？所以選D。
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