单选题 It wasn’t until recently, when we celebrated a family birthday with my parents at a fancy restaurant, _____ I found out that in some cultures it’s considered rude to lick your plate.
【正确答案】 A
【答案解析】句意：直到最近当我和父母在一家豪华餐馆庆祝一次家庭生日聚会时，我才发现，在某些国家的文化中，舔盘子被认为是粗俗无礼的。本句是强调句式It is...that与not until的混合式。