問題詳情
20 The traditional airline marketplace has been ____________ dramatically by e-commerce because an increasing numberof travelers have switched to using internet-based services to manage their travel life cycles.
(A) established
(B) maintained
(C) promoted
(D) transformed
參考答案
答案：D
難度：適中0.588235
統計：A(1),B(4),C(0),D(10),E(0)