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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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