当前位置:百科知识 > 知到吹弹得破答案

问题描述:

[单选] A beam of light will not bend(弯曲)round corners unless()to do so with the help of a reflecting device(反射装置)。
A.made B.being made C.having made D.to be made
参考答案:查看
答案解析:
☆收藏

随机题目