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
(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)
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