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Science and technology are advancing so quickly that________ is a possibility today may be a reality tomorrow．

    A．that             B．which            C．不填         D．what

Science and technology are advancing so quickly that _____ is a possibility today may be a reality tomorrow．

       A．that                 B．which           C．不填          D．what

Science and technology are advancing so quickly that _____ is a possibility today may be a reality tomorrow．

       A．that       B．which               C．不填               D．what

Science and technology are advancing so quickly that________ is a possibility today may be a reality tomorrow．

    A．that             B．which            C．不填         D．what

Science and technology are advancing so quickly that________ is a possibility today may be a reality tomorrow．

　 A．that　 　　　　　 B．which　　　 　 C．不填　　　 D．what