Question

The students were participating ________an international energy-saving competition between towns in New England and Canada．

1. A.
   for
2. B.
   in
3. C.
   to
4. D.
   at

Answer 1

B
participate in 参加，参与，为一固定搭配。句意为“学生们正在参加在
新英格兰与加拿大两镇之间进行的国际节能进竞赛”．