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The distance in the universe is told ___ light years .

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The distance in the universe is told ___ light years .
A by B in C with D for
对啊,我也选A 但给的答案是第二项,我感觉不对呢,也没查到它的用法啊.
The distance in the universe is told ___ light years .
应该是B in in light years 以光年为单位 单位名称前必须加in 如 in dollar terms,in volts,in pounds等等,指以xx为单位.