摘要： A beam of light will not bend round corners unless to do so . A. made B. having made C. being made D. to be made
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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.having been made B.being made C.made D. you make
查看习题详情和答案>>A beam of light will not bend round corners unless ________ to do so with the help of a reflecting device．
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A．having been made
B．being made
C．made
D．been made