2. 专升本
  3. A beam of light will not bend round corners unless______to do so with the help of a reflecting device.

A beam of light will not bend round corners unless______to do so with the help of a reflecting device.

admin2019-11-21  53
问题 A beam of light will not bend round corners unless______to do so with the help of a reflecting device.
选项 A、made
B、being made
C、having made
D、to be made
答案A
解析 unless made状语从句中省略了it is。完整的句子应是unless it ismade…科技文献中常可见到这种语法现象。
转载请注明原文地址:https://kaotiyun.com/show/TExC777K
本试题收录于： 英语题库普高专升本分类
0

英语

普高专升本

相关试题推荐
随机试题
最新回复(0)