题目内容
The students were participating ________ an international energy-saving competition between towns in New England and Canada．
[ ]
A．for
B．in
C．to
D．at
答案：B
练习册系列答案
相关题目
题目内容
The students were participating ________ an international energy-saving competition between towns in New England and Canada．
A．for
B．in
C．to
D．at