单选题 The passage indicates that Montessori and Dewey ______.

A、 contributed to the history of education
B、 began the preschool movement
C、 helped each other establish the nursery schools
D、 completed the early education leaders' contributions to the preschool movement

【正确答案】 D

【答案解析】从文章第二段第三句中“...important additions were made by Montessori，Dewey，and others．”可知D是正确答案。