求问大神一道GWD!!!

蒸蒸大侠

251. (GWD-1-Q29)

Faulty voting equipment,confusing ballots, voter error, and problems at polling places have been citedby a new study of the 2000 United States presidential election, which estimatedthat they did not count 4 million to 6 million of the 100 million votes cast.

A.    Faulty voting equipment, confusing ballots, voter error, and problems atpolling places have been cited by a new study of the 2000 United Statespresidential election, which estimated that they did not count 4 million to 6million of the 100 million votes cast.

B.    Citing faulty voting equipment, confusing ballots, voter error, andproblems at polling places, a new study of the 2000 United States presidentialelection has estimated that 4 million to 6 million of the 100 million votescast were not counted.

C.    Citing faulty voting equipment, confusing ballots, voter error, andproblems at polling places, 4 million to 6 million of the 100 million votescast were not counted in the 2000 United States presidential election, a newstudy estimates.

D.     A new study has citedfaulty voting equipment, confusing ballots, voter error, and problems atpolling places in estimating that 4 million to 6 million of the 100 millionvotes that were cast had not been counted in the 2000 United Statespresidential election.        (B)

E.    A new study of the 2000 United States presidential election, citingfaulty voting equipment, confusing ballots, voter error, and problems atpolling places, has estimated 4 million to 6 million votes had not been countedof the 100 million votes cast.

我现在下看PREP笔记，遇到这样一道题，答案选B。

当ing 放句首时主语后主句主语保持一致，B中主语也就是 a new study, 那为什么a new study能发出主动动作去 cite呢？不应该是 cited吗？

谢谢各位大神！

alzn2765

cited的话就是something cite a new study了