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.
A they have established themselves as supreme adapters in an era when the capability
B they have established themselves as being supreme adapters in an era when being able
C it has established itself as a supreme adapter in an era when to be able
D it has established itself as being a supreme adapter in an era when its ability
E it has established itself as a supreme adapter in an era when the ability
问题在于C和E, C中 when to be able......和 E的 when the ability to.....为什么C不行呢 不定式不是也能作主语吗 麻烦大家来解救一下我。。。。
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发表于 2017-5-18 17:58:07
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