一道PP语法

pploo

也许前面有过,但没有时间去找拉,麻烦那位再解答一下
. _________, domesticated grapes grow in clusters,
  range in color from pale green to black, and contain
  sugar in varying quantities.

      Their botanical classification as berries  
      Although their botanical classification as
         berries  
      Because berries being their botanical
         classification  
      Classified botanically as berries  
为什么是D? D中谁是主语?

yongchou

D, there's no suject in D, because it is only a participle phrase, not a sentence.

pploo

是我没有看清题,吧DOMESTIATED当谓语拉,太粗心拉.犯低级错误.
谢谢,谢谢!