問題詳情

【題組】63. The carriers’ participation in the system is determined by _______.
(A) the US federal government
(B) mobile phone users
(C) the carriers themselves
(D) the law of the United States

參考答案

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)