Abeamoflightwillnotbendroundcorn

发布时间:2020-07-27 06:06:09

A beam of light will not bend round corners unless______to do so with the help of a reflecting device.A.having been madeB.being madeC.madeD.you make

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C解析unless引起条件状语从句中后面省略了it was。
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