问题
选择题
Windows 7 was created in 2009, many computer lovers were interested and excited.
A．when
B．where
C．why
D．which
答案
答案：A
题目分析：考查定语从句：句意：Windows 7是在2009年创建的，那时很多电脑用户很高兴很兴奋。先行词是2009年，定语从句中不缺主宾表，缺时间状语，选A。
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