In 1997, despite an economy that marked its sixth full year of uninterrupted expansion with the lowest jobless rate in a quarter century, the number of United States citizens declaring themselves bankrupt has jumped by almost 20 percent, at 1.34 million.
(A) declaring themselves bankrupt has jumped by almost 20 percent, at
(B) declaring themselves bankrupt jumped by almost 20 percent, to
(C) who declared themselves bankrupt has jumped by almost 20 percent, to
(D) who declared themselves bankrupt jumped almost by 20 percent, at
(E) to declare themselves bankrupt jumped almost by 20 percent, at
一个细节问题：这里的to、 at有区别吗？分别该怎么用？
to是增加到。。。。at是增加了。。。。。。
然后根据时态，可以选出B
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