11. The way in which the mighty blue whale and
the other baleen whales—the finback, gray,
humpback, and right whales—eats was
discovered by careful observation by
A. eats was discovered by
B. eat was discovered through
C. eats were discovered by means of
D. eat were discovered by
E. eat was discovered resulting from
答案是D，可是D的话，the way 后面就跟了were，不是主谓不一致了么？
Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete one day may be partners the next.
A.Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete
B.Although the lines of competition are clearly defined in industries that are more established, they are blurred and indistinct in the Internet industry, as competing companies
C.The lines of competition are clearly defined in the more established industries, unlike the Internet where they are blurred and indistinct, as companies that compete
D.Unlike more established industries, where the lines of competition are clearly defined, they are burred and indistinct in the Internet industry, as companies that compete
E.Unlike more established industries, with clearly defined lines of competition, those of the Internet industry are blurred and indistinct, as competing companies
这是GWD17-Q14，答案是B，但是不知道为什么。
Construction of the Roman Colosseum, which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian, was completed a decade later, during the reign of Titus, who opened the Colosseum with a one-hundred-day cycle of religious pageants, gladiatorial games, and spectacles.
A.which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian,
B.officially known as the Flavian Amphitheater, begun in A.D. 69, during the reign of Vespasian, and
C.which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian, and
D.officially known as the Flavian Amphitheater and begun in A.D. 69, during the reign of Vespasian it
E.officially known as the Flavian Amphitheater, which was begun in A.D. 69, during the reign of Vespasian, and
GWD17-Q20，答案是C，可是C不是缺谓语了吗？？
Q23p2-sc 9.(24819-!-item-!-188;#058&001693)
The Environmental Protection Agency frequently puts mandatory controls on toxic substances that present as little risk as one in a million chances to cause cancer.
(A) as little risk as one in a million chances to cause
(B) as little risk as one chance in a million of causing
(C) as little risk as one chance in a million that it will cause
(D) a risk as little as one chance in a million for causing
(E) a risk as little as one chance in a million for it to cause
这一题，完全不知道怎么入手！！！
Nine months after the county banned jet skis and other water bikes from the tranquil waters of Puget Sound, a judge overturned the ban on the ground of violating state laws for allowing the use of personal watercraft on common waterways.
(A) of violating state laws for allowing
(B) of their violating state laws to allow
(C) that it violates state laws that allowed
(D) that it violated state laws allowing
(E) that state laws were being violated allowing
我想问这题不选C是因为that应该改为those吗？