問題詳情

2. The development of industry has been _______ gradual process throughout ______human existence from stone tools to modern technology.
(A) 不填； the
(B) the；a
(C) a；不填
(D) a；a

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)