GWD30-31

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

这道题答案是C,我是用排除法选的. 但不十分清楚为什么对.第一个句子的主语是什么,是moving a ton of wheat from Buffalo to New York City 吗? 现在分词可以做主语吗? 谢谢!

这里可能是动名词

不是分词，分词的话就得有修饰对象了

moving在这里是动名词，不是现在分词。

关于这句话我有个小问题，cost的过于时也是cost吗？还是这里用的是一般现在时？

过去时和完成时均为costed，这里是一般现在时。

类似例子如下：

Participating in the strike cost me my job.
参加罢工而使我失去工作。

mm笔误了

cost/cost/cost

原型/过去式/过去分词

刚刚查了一下，在一般情况下cost的原型、过去时、过去分词都为cost

但是在作“估计...的成本”解时过去时及过去分词为costed,如 The builder costed the job at $150.（朗文英语双解词典）

动名词做主语,大全中也有

C the best  大全311例

1.                  Foreign investors, because of their growing confidence in their capability for making profitable investments in the United States, have been led to move from passive involvement in commercial real estate partnerships to active development of their own increasingly ambitious projects.

(A) Foreign investors, because of their growing confidence in their capability for making profitable investments in the United States, have been led

(B) Foreign investors, growing confident about their capability for making profitable investments in the United States, has led them

(C)
            Growing confidence in their ability to make profitable investments in the United States has led foreign investors

(D) Growing confidence in their ability for making profitable investments in the United States have led foreign investors（C）

(E) Growing confident about their capabilities for making profitable investments in the United States, foreign investors have been led