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求問 選項 D 如何更正
| In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is lined with lead around the perimeter, thereby improving stability in flight and resulting in longer throws. | | A. In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is | | B. According to a previous design, the weight of the discus used in track competition was concentrated in a metal center, but now it is | | C. Once designed with its weight concentrated in a metal center, the discus used in track competition is now | | D. The discus used in track competition, once designed with its weight concentrated in a metal center, but now | | E. The discus used in track competition was once designed having its weight concentrated in a metal center and now |
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发表于 2010-1-6 11:32:11
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