There are fewer teaching positions left in big cities, ______ at the same time t
题型：不详难度：来源：
| There are fewer teaching positions left in big cities, ______ at the same time there are shortages of teachers in small towns． |
答案
| B |
解析
| 考查连词。or 表选择关系；and表并列关系；so和for表因果关系。句子前后是并列关系，所以选B。 |
举一反三
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