___D__ some mammals came to live in the sea is not known.[ ] A.Which B.Since C.Although D.How为什么不用which 选D 但选how是做known的宾语?
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![___D__ some mammals came to live in the sea is not known.[ ] A.Which B.Since C.Although D.How为什么不用which 选D 但选how是做known的宾语?](/uploads/image/z/7455829-13-9.jpg?t=___D__+some+mammals+came+to+live+in+the+sea+is+not+known.%5B+%5D+A.Which+B.Since+C.Although+D.How%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E7%94%A8which+%E9%80%89D+%E4%BD%86%E9%80%89how%E6%98%AF%E5%81%9Aknown%E7%9A%84%E5%AE%BE%E8%AF%AD%3F)
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