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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.
- leaking its cargo of 750,000 gallons into the ocean, while causing the pollution of
- with its cargo of 750,000 gallons leaking into the ocean, and it polluted
- and its cargo of 750,000 gallons leaked into the ocean, polluting
- while it leaked its cargo of 750,000 gallons into the ocean and caused the pollution of
- 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.
- it has established itself as a supreme adapter in an era when to be able
- 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！ | 
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发表于 2008-9-5 18:37:00
发表于 2008-9-5 23:23:00
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