We ____ separate and say good-bye to each other sooner or later. ( )
·bound
·bound to
·are bound to
·are bound
出自：华北水利水电大学英语
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We ____ separate and say good-bye to each other sooner or later. ( )
·bound
·bound to
·are bound to
·are bound
出自：华北水利水电大学英语