问题
选择题
The days are gone ________ we could leave our door unlocked at night.
A．where
B．which
C．when
D．while
答案
答案：C
考查分割式定语从句。先行词为the days，谓语是are gone，后面的从句不缺少主语或宾语，缺少时间状语，所以使用关系副词。故选C。
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