Teterboro is the same airport where a plane took off earlier this morning before colliding (碰撞)with a sightseeing helicopter over the Hudson River.
A. where
B. as
C. that
D. which
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(答案→)A. where
B. as
C. that
D. which
解析： 四个选项分别表示哪儿、由于、那个和哪一个，在非限定性定语从句中当前置词为地点类词语时引导词用where，airport机场，选A。