【d】【D】The dog and the duck sat in front of the door

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                                                    Big D   大D

                                                    Little d   小d

                                            Duck,duck   鸭子，鸭子

                                                Door,door  门，门

                                                Dog,dog   狗，狗

                            The dog and the duck sat in front of the door.

                                        小狗和小鸭子坐在了门的前面。