ＴＴＧＷＤ３０－３１为什么Ａ不行啊，谢谢拉

Q31:

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.

1. 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
2. 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
3. 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
4. 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
5. 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

C明显不对啊，the move指代不清

自己顶一下

a 句子里的it指什么呢?

完全是靠排除来做题，最后选出来的答案一团糟，一点都不符合ETS自己的一些原则，ETS已经走火入魔了！好端端的语言非得说的让大家都听不懂真恶心！

抒发一下内心的气氛！！

頂一下