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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.
admin
2014-05-25
28
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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本试题收录于:
英语题库普高专升本分类
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