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.

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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。
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