麻烦大神点进来 ！SC 一道老题， 怎么就句子不完整了 ？？

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When a ton of wheat was being moved from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100, but when the canal was used, it took less than eight days and cost less than $6.

• A When a ton of wheat was being moved from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100, but when the canal was used, it 分析该选项
• B Moving a ton of wheat from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100; using the canal, it 分析该选项
• C Before the opening of the Erie Canal in 1825, moving a ton of wheat from Buffalo to New York City took three weeks and cost $100; on the canal the move 分析该选项
• D In 1825, before opening the Erie Canal, to move a ton of wheat took three weeks from Buffalo to New York City, which cost $100; moving it on the canal 分析该选项
• E  To move a ton of wheat in 1825 from Buffalo to New York City took three weeks before the opening of the Erie Canal, costing $100, but in using the canal, the move
  

我不明白的是选项  DE ， 答案说  DE 句子没有谓语，句子结构不完整？

D中，  to  move  是主语  took  是谓语。 这里which修饰错误。  ;  moving  是主语  took是谓语

E中，   to  move  是主语  took  是谓语。but后  the move 是主语， took 是谓语 。

麻烦大神解答解答 。   

ifcan1314

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