I know, he has been married.A. As long asB. As soon asC. As far asD. As well as

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A. As long as
B. As soon as
(答案→)C. As far as
D. As well as
解析：as far as I know意为“据我所知”；as long as意为“只要”；as soon as意为“一……就……；as well as意为“也；又”。