Question

You can make a complaint to the local government ___ you are happy with the way they deal with the matter.

1. A.
   unless
2. B.
   if
3. C.
   once
4. D.
   as

Answer 1

A
试题分析：unless除非 if 如果once一旦 as当…时，根据句意，你可以埋怨当地政府，除非你对他们处理事情的方式满意。故选A
考点：考查连词辨析
点评：不同的连词要放在上下文中进行考查，要注意一词多义，如as当…时；尽管；由于；