请教一道pp语法

iamyaoyao · 发表于 2010-4-8 12:54:23

Once designed with its weight concentrated in a metal center,the discus used in track competition is now lined with lead around the perimeter,thereby proving stability in flight and resulting in long throws.
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
原句正确，但是B哪儿错了呢？

conniequan · 发表于 2010-4-8 14:49:50

同意

tracyforever · 发表于 2010-4-8 14:01:44

Gmat中不要乱用it

切尔西 · 发表于 2010-4-8 13:38:23

According to a previous design的逻辑主语是the weight，逻辑意思不合理

请教一道pp语法

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