最近刚做了前3套题，碰到些不明白的，望NN们解答下，万分感谢啊~~
GWD1-Q8:
The 32 species that make up the dolphin family are closely related to whales and in fact include the animal known as the killer whale, which can grow to be 30 feet long and is famous for its aggressive hunting pods.
A. include the animal known as the killer whale, which can grow to be 30 feet long and is
B. include the animal known as the killer whale, growing as big as 30 feet long and
C. include the animal known as the killer whale, growing up to 30 feet long and being
D. include the animal known as the killer whale, which can grow as big as 30 feet long and is
E. include the animal known as the killer whale, which can grow to be 30 feet long and it is
（为什么不选C？）
GWD3-Q19:
Possible long-term consequences of the “greenhouse effect,” the gradual warming of the Earth’s climate, may include melting the polar ice caps and a rising sea level.
A. may include melting the polar ice caps and a rising sea level
B. may include the melting of polar ice caps and the rising sea level
C. may include polar ice caps that are melting and sea levels that are rising
D. include melting the polar ice caps and sea levels that are rising
E. include melting of the polar ice caps and a rise in sea level
（为什么不选B?）
GWD3-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.
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
(为什么不选C？)
A leading figure in the Scottish enlightenment, Adam Smith’s two major books are to democratic capitalism what Marx’s Das Kapital is to socialism.
A. Adam Smith’s two major books are to democratic capitalism what
B. Adam Smith’s two major books are to democratic capitalism like
C. Adam Smith’s two major books are to democratic capitalism just as
D. Adam Smith wrote two major books that are to democratic capitalism similar to
E. Adam Smith wrote two major books that are to democratic capitalism what
（为什么用WHAT呢？）
希望大家帮忙解答，感谢感谢!!!
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