She will never forget here stay there she found her son who had gone missing two years before.
A. that
B. which
C. where
D. when
网友回答
A. that
B. which
C. where
(答案→)D. when
解析：句意：她永远不会忘记她在这里逗留期间她发现两年前丢失的儿子。这句话用了定语从句，先行词是stay“逗留期间”，定语从句中不缺少主宾表，缺少的是时间状语，用when引导定语从句，所以选D。