问题
选择题
He’ll never forget his stay in the park ________ he found his cellphone which had gone missing days before.
A．that
B．when
C．where
D．which
答案
答案：B
题目分析：考查定语从句：句意：他永远忘不了在公园逗留的期间，那时他发现了几天前丢失的手机。先行词是his stay，表示时间，定语从句中缺少时间状语，选B。