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。