She'll never forget her stay there ______ she found her son who had gone missing two years before.
无
A、
that
B、
which
C、
where
D、
when
【正确答案】
D
【答案解析】
her stay为先行词，可以理解为抽象的一段时间(她待在那里期间)，when指代her stay在定语从句中作时间状语。
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