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完成下列证明过程,并在括号内填上依据.

如图,点E在上,点上, . 求证:ABCD.

证明:(已知),),

      ▲      (等量代换),

      ▲      同位角相等,两直线平行

C(                                                                                                              ).

(已知),

                                                  ),

                                                                                                                                            )

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