OG12 23

tt242424 · 发表于 2011-2-20 21:07:05

23. 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.
E, The discus used in track competition was once designed having its weight concentrated in a metal center and now
这个E选项为什么错啊，Og的解释是 the sentence is missing a main verb in the final phrase; was once designed must be followed by is now lined.
OG的这两个理由分别是什么意思啊，我觉得不差谓语动词啊，还有为什么was once designed 要被is now lined跟着了
谢谢

shallbytwo · 发表于 2011-2-21 10:31:34

选项e后面半句but lined xxx缺少了be动词。

tt242424 · 发表于 2011-2-21 13:50:16

对啊，
另外问一下，那如果用相同be动词，后面那个be动词可以省吗

Gail小M · 发表于 2011-2-21 14:33:25

应该在不引起歧义的情况下，是可以省略掉的额~

tt242424 · 发表于 2011-2-22 19:44:54

谢谢

lusfe · 发表于 2011-4-4 16:51:53

对啊，
另外问一下，那如果用相同be动词，后面那个be动词可以省吗

-- by 会员 tt242424 (2011/2/21 13:50:16)

1. 因为前后句的时态是不同的，所以也没可能省略。
2. was once designed 跟 is now lined 是 parallelism

laria_line · 发表于 2011-4-4 18:35:59

同意楼上，helping verb在时态不同时，后一句的必需补充完整。

OG12 23

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