再次求教！OG12 SC100

leexiaomi2011

The stars, some of them at tremendous speeds, are in motion just as the planets are, yet being *so far away from the Earth that their apparent positions in the sky do not change enough for their movement to be observed during a single human lifetime.

A) The stars, some of them at tremendous speeds, are in motion just as the planets are, yet being

B) Like the planets, the stars are in motion, some of them at tremendous speeds, but they are

C) Although like the planets the stars are in motion, some of them at tremendous speeds, yet

D) As the planets, the stars are in motion, some of them at tremendous speeds, but they are

E) The stars are in motion like the planets, some of which at tremendous speeds are in motion but

我的问题点和之前的不太一样：为什么不能选D？D项用as有什么问题？OG解释说as必须引导一个从句----什么时候有这样的规定？还是说我的理解有问题？

谢谢各位牛人！！！

huangyouhuifei

The stars, some of them at tremendous speeds, are in motion just as the planets are, yet being *so far away from the Earth that their apparent positions in the sky do not change enough for their movement to be observed during a single human lifetime.

A) The stars, some of them at tremendous speeds, are in motion just as the planets are, yet being

B) Like the planets, the stars are in motion, some of them at tremendous speeds, but they are

C) Although like the planets the stars are in motion, some of them at tremendous speeds, yet

D) As the planets, the stars are in motion, some of them at tremendous speeds, but they are

E) The stars are in motion like the planets, some of which at tremendous speeds are in motion but

我的问题点和之前的不太一样：为什么不能选D？D项用as有什么问题？OG解释说as必须引导一个从句----什么时候有这样的规定？还是说我的理解有问题？

谢谢各位牛人！！！

-- by 会员 leexiaomi2011 (2011/5/14 15:18:18)

as后面跟句子或介词短语，跟名词则错。如：
Jim, as Lily do, dances well.-->correct
The population of China, as of India, is growing very fast.-->correct
As GRE, GMAT is difficult.-->Incorrect
like之后跟名词对，其他错。

leexiaomi2011

哦，原来as后面确实不能只跟名词。看来我中学的语法都忘光了。
谢谢楼上的细心帮助！！！

ak007

as后面加名词 表示“作为...”
          加句子表示对比