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 本题为主语承前省略问题。在状语从句中,如果主语的谓语在人称数上和主句一致即可省略。因此,B项实际上相当于it is made,it is被省略。本句大意为:除非装有反射作用的设备,否则一束光不会在角落处拐弯。
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