We are living in an age many things are done on computer.A. whichB. thatC. whoD. when

问题补充：

We are living in an age many things are done on computer.

A. which

B. that

C. who

D. when

答案：

A. which

B. that

C. who

(答案→)D. when

解析：考查定语从句。定语从句When many things are done on computer修饰先行词an age,这个定语从句非常完整，所以使用关系副词when。句意：我们生活在一个很多事情都可以在计算机上完成的时代。