谁来帮我解释一下GWD这两题，完全不懂的说

CoralOcean

Q20:

In January 1994 an oil barge ran aground off the coast of San Juan, Puerto Rico, leaking its cargo of 750,000 gallons into the ocean, while causing the pollution of the city’s beaches.

 

1. leaking its cargo of 750,000 gallons into the ocean, while causing the pollution of
2. with its cargo of 750,000 gallons leaking into the ocean, and it polluted
3. and its cargo of 750,000 gallons leaked into the ocean, polluting
4. while it leaked its cargo of 750,000 gallons into the ocean and caused the pollution of
5. so that its cargo of 750,000 gallons leaked into the ocean, and they were polluting

为什么是C啊，平行对称在那里啊，A为什么不对呢？

Q28:

The coyote is one of several recent ecological success stories:  along with the white-tailed deer, the moose, and other species that are enlarging their natural domains, they have established themselves as supreme adapters in an era when the capability to adjust to the environmental changes wrought by human beings has created a whole new class of dominant large mammals.

 

1. it has established itself as a supreme adapter in an era when to be able
2. it has established itself as a supreme adapter in an era when the ability

给出的答案是B,可是A错在那里了呢，为什么when之后不能用to be able啊！

dianecarton

恩

[此贴子已经被作者于2008-9-11 23:19:25编辑过]

aeoluseros

恩，再补充一下，并请求各位检查一下我的思路：
Q20 A里面 while causing是状语从句的省略，逻辑主语是主句主语，an oil barge是不会causing的，应该是leaked这件事情causing的。所以逻辑错误。
        leaking its cargo of 750,000 gallons into the ocean逻辑主语是an oil barge，an oil barge主动地leak逻辑也错误。应该把这两件事放到两个子句里说。


        Q28 A里面(怎么跟原句不同？)when to be able to adjust to the environmental changes wrought by human beings has created a whole new class of dominant large mammals. 你看has created，前面的主语不能是to be able to do，to be able to do这个表示将来的行为是无法has created的，逻辑矛盾。只有ability才能够has create.
    ps:when是能够接不定式的吧，当不定式是做主语的时候...

CoralOcean

这下清楚了，谢谢指点。