很高興為您
Mary will never forget the day ___ she found her son who had gone missing three years before.
A.when B.which C.where D.that
day后面為一個(gè)定語(yǔ)從句修飾它,先行詞是day
(when) she found her son who had gone missing two years before
= (on which) she found her son who had gone missing two years before
= (on the day) she found her son who had gone missing two years before
她永遠(yuǎn)也不會(huì)忘記她找到失蹤了三年的兒子的那一天.
很明顯,該定語(yǔ)從句缺少時(shí)間狀語(yǔ).
即所謂的關(guān)系副詞when = 介詞(on) + 關(guān)系代詞which = 介詞(on) + 先行詞(the day).
而關(guān)系代詞that/which只能等于先行詞the day,無(wú)法直接放入定語(yǔ)從句中做成分；
where在定語(yǔ)從句中充當(dāng)?shù)攸c(diǎn)狀語(yǔ),而不是時(shí)間狀語(yǔ).
答案是【A】
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