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请教一道语法题~~~

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发表于 2013-4-1 00:59:23 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
Organized in 1966 by the Fish and Wildlife Service, the Breeding Bird Survey uses annual roadside counts along established routes ________________more than 250 bird species, including 180 songbirds.
A.for monitoring of population changes of as many as, or o
fB.to monitor population changes of as many, or
C.to monitor changes in the populations of
D.that monitors population changes ofD.that monitors changes in populations of as many as, or


请问b哪里错了?怎么改啊?
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