The students were participating an international energy saving competition between towns in New Engl

题目简介

The students were participating an international energy saving competition between towns in New Engl

题目详情

The students were participating             an international energy saving competition between
towns in New England and Canada.    
[     ]
A.for    
B.in    
C.to    
D.at
题型:单选题难度:中档来源:同步题

答案

B

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