15. The horseshoe-shaped glass walkway, a popular _____ for tourists since it opened in 2007, is just outside
Grand Canyon National Park.
(A) repellent
(B) destination
(C) fragment
(D) tantrum
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統計: A(15), B(187), C(27), D(24), E(0) #2913518
統計: A(15), B(187), C(27), D(24), E(0) #2913518