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题目内容双击单词支持查询和收藏哦～
The sea was not an _____ the diffusion of the windmill; on the contrary, while the concept of the new invention passed quickly from seaport to seaport, it made little headway inland.
- A.element in
- B.issue in
- C.aid to
- D.obstacle to
- E.promotion of
D显示答案
以上解析由 考满分老师提供。
