Question

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

A．that

B．which

C．where

D．when

Answer 1

D

考查定语从句的用法。her stay为先行词，可以理解为抽象的一段时间（她呆在那里期间），when指代her stay在定语从句中做时间状语。