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:C
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。