Linda can't attend the party( )at Tom's house at present bac

Linda can't attend the party( )at Tom's house at present bacause she is preparing a speech for the party( )at Marie's house tomorrow.A.being held;to be heldB.to be held;heldC.held;being heldD.to be held;to be held请给出相应的语法解析,拒绝菜鸟