The project is based on an agreement one of purposes is to ensure that the project can b

问题补充：

The project is based on an agreement, one of purposes is to ensure that the project can be accomplished before the deadline.

A. its

B. which

C. whose

D. what

答案：

A. its

B. which

(答案→)C. whose

D. what

解析：考查定语从句。本句先行词为agreement，关系代词whose指代the project在定语从句中修饰purpose做定语。句意：这个工程是建立在大家协议的基础之上的，它的目的之一就是保证这这个工程能在最后期限之前完成。