2. 考研
  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 本题考查状语从句的省略。题干中unless引导的是条件状语从句，其主从句的时态遵循“主将从现”的规则，故该句中unless引导的条件状语从句是a beam of light is made to do so with the help of a reflecting device。当状语从句的主语和主句的主语一致时，可以省略状语从句的主语和be动词，故答案为B项。
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