问题
选择题
There are fewer teaching positions left in big cities, ____ at the same time there are shortages of teachers in
small towns. [ ]
A. or
B. and
C. so
D. for
答案
答案：B
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There are fewer teaching positions left in big cities, ____ at the same time there are shortages of teachers in
small towns. [ ]
A. or
B. and
C. so
D. for
答案：B