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题库 / GMATLA-SC-117
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.
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
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
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
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
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
题目分析：
略。
选项分析：
A选项：代词it的指代对象只能是名词不能是句子，但在逻辑上，“花了三周的时间并且花费了100块”的应该是“把一吨的小麦从Buffalo这个地方移到纽约城这个事件”，因此句中it没有正确的指代对象。
B选项：代词it的指代对象错误同(A)。
C选项：Correct. 本选项在语法和逻辑上均是正确的。
D选项：不定式短语to move a ton of wheat需改成moving a ton of wheat from Buffalo to New York City，这点考查了不定式和ing的区别。用之于本题，在逻辑上我们讨论的是“从Buffalo移动小麦到纽约”这件事客观上会花费多长时间，而不是某一次或某一个人移动小麦的情况。另外，介词短语from Buffalo to New York City需紧挨着放在to move a ton of wheat身边。该介词短语是状语，需就近修饰一个句子。在本选项中其修饰的是took three weeks而不是move a ton of wheat。
E选项：不定式短语to move a ton of wheat需改成moving a ton of wheat from Buffalo to New York City错误同(D)。
for doing 表示一件已经发生的事情的原因；to do表示一件未发生的事情的目的
E：in using the canal修饰the move，邏輯主語错误，the move不能够use canal，use的主语應是"人"
Eo move a ton of wheat需改成moving
it要做形式主语也只能说it took sb some time／money to do sth，也不知道是必须有sb还是必须有to do sth还是都要有
it在AB情境下做不了形式主语，千万看清！
it要做形式主语也只能说it took sb some time／money to do sth，也不知道是必须有sb还是必须有to do sth还是都要有
A、B中的it试图指代一整个句子，但是it只能完全指代一个名词（具体用法见p11），这里面显然想指代一整个句子；D中的which引导的定语从句也有问题，首先，which的修饰要尽可能低靠近先行词，如果就近来看，修饰city显然不对；另外就算让which往前修饰，cost的主语应该是运货这个行为，但是定语从句只能修饰名词，显然是有问题的；E中的逻辑主语变换了，前半句话是这个动作为主语，but连接in doing显然需要人作主语，逻辑主语变换了
a, it指代不对
on the canal
指代问题...把A看成形式语句句式了..唉 没认真看
①in 1825是修饰这个opening的，所以the opening of XXX in 1825 是比较合适的，放在很前面就修饰的很不清楚
②It takes five hours out of her week to do this.通常it做形式主语之后，后面都有个to do sth 相当于真正的主语
请问It不可以做形式主语吗
A选项的it不能看成形式主语吗？
不能吧。那真正的主语呢？it took three weeks and cost $100后面没有不定式，也没有that从句。
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