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[Sentence Correction]
试题详情
题目：
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.
选项:
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
答案:
C
提问：
听了一下已有解答，感觉不是很明白。我选了b，想问下b的错误是单纯的语意不对吗？还是有别的错误，比如it is now的it指代不清？我读b感觉说discus的重量之前在中心，现在围绕着周边。自己感觉这个语义逻辑说的过去啊。重量分布本来就可以在中间也可以四周啊。重量也可以对于飞行产生影响啊。
解答：
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提问：
听了一下已有解答，感觉不是很明白。我选了b，想问下b的错误是单纯的语意不对吗？还是有别的错误，比如it is now的it指代不清？我读b感觉说discus的重量之前在中心，现在围绕着周边。自己感觉这个语义逻辑说的过去啊。重量分布本来就可以在中间也可以四周啊。重量也可以对于飞行产生影响啊。
解答：
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阅读2769
提问：
选成了B, 想知道如何做题的时候判断BC哪个更好
解答：
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