试题题干
The project（）they have been working for two years is a total failure.
参考答案
正确答案：
试题解析
本题考查定语从句关系词的选择。将先行词带入定语从句they have been working on the project for two years，用which代替先行词the project。所以选C选项。句意：他们工作了两年的项目完全失败了。
The project（）they have been working for two years is a total failure.
本题考查定语从句关系词的选择。将先行词带入定语从句they have been working on the project for two years，用which代替先行词the project。所以选C选项。句意：他们工作了两年的项目完全失败了。