英语翻译the biggest changes in education he has seen have been smaller classes and the use of computers in the classroom,he said."we had no smartboards but plenty of chalk,"Father Schneider said.know one of the biggest changes in education father

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英语翻译
the biggest changes in education he has seen have been smaller classes and the use of computers in the classroom,he said."we had no smartboards but plenty of chalk,"Father Schneider said.
know one of the biggest changes in education father schneider experienced was______
A.plenty of chalk
Bthe smaller chassroom
C.the introduction of men teachers
D.the use of computers and smrtboards
答案是选D为什么?不是we had no smartboards but plenty of chalk吗,关键这句不理解

t汉语大意,第一句,他说,我所看到的教育上的最大改变就是小班教学化和电脑在教室的使用.
smartboard汉语是 电子白板.
第二句意思,father schneider说,除了粉笔外我们没有电子白板.这句话应该是描述过去的状态和现在做对比.
题目问的是,我们知道,在教育上,father schneider所经历的最大改变之一是Xxxx?