問題詳情

Since computers were first introduced in the early 1980s, technology ____ a great deal.
(A) changes
(B) changed
(C) has changed
(D) had changed

參考答案

答案：C
難度：適中0.576923
統計：A(1),B(12),C(150),D(74),E(0)

用户評論

【Dory Chao】評論

(ever) since...後面若接從屬子句時，子句內的動詞用「過去式」(V-ed)。另一邊的主要子句用「現在完成式」(have/ has + PP.)