We are living in an age many things can be done on computers and the Internet.A. whichB.

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A. which
B. that
C. whose
(答案→)D. when
解析：本题考查定语从句。when引导定语从句修饰先行词an age，when在从句中作时间状语。句意为“我们生活在一个可以在电脑和互联网上做许多事情的时代”。