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题目内容
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.
- Aelement in
- Bissue in
- Caid to
- Dobstacle to
- Epromotion of
D显示答案
以上解析由 考满分老师提供。