2. 专升本
  3. Since computers were introduced, they_______to be useful tools for people weak in math.

Since computers were introduced, they_______to be useful tools for people weak in math.

admin2021-02-24  853
问题 Since computers were introduced, they_______to be useful tools for people weak in math.
选项 A、had proved
B、have proved
C、will prove
D、are proving
答案B
解析 句意：自电脑问世以后，它们已被证明对数学薄弱的人们来说是有用的工具。since 引导的从句中的动词为一般过去时，主句用现在完成时，故选B。
转载请注明原文地址:https://kaotiyun.com/show/Aq4C777K
本试题收录于： 英语题库成考专升本分类
0

英语

成考专升本

相关试题推荐
随机试题
最新回复(0)