题目内容

How long do you believe it will be _____ Chinese people land on the moon?
A．beforeB．sinceC．whenD．that
A
考查连词的用法，before 在什么之前，才，就，since 自从，when 当什么时候，句意：你认为还要多久中国人才能在月球上着陆。所以选A。
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