She’ll never forget her stay there she found her son who had gone missing two years before

问题补充：

She’ll never forget her stay there she found her son who had gone missing two years before.

A. when

B. where

C. that

D. which

答案：

(答案→)A. when

B. where

C. that

D. which

解析：此题重点考查when引导的时间状语从句。