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

A beam of light will not bend round the 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 the corners unless______ to do so with the help of a reflecting device.
选项 A、being done
B、made
C、to be made
D、having made
答案B
解析 省略了主语和系动词的分词状语结构。
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