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题目内容双击单词支持查询和收藏哦～
Technological developments in the nineteenth century took longer to ________ than they do today: many of that century's advances were known to scientists but not to average people.
- A.occur
- B.propagate
- C.accelerate
- D.multiply
- E.spread
- F.increase
B,E显示答案
以上解析由 考满分老师提供。
