old prep 里一道语法题

hellrose · 发表于 2014-3-27 20:34:41

Organized in 1966 by the Fish andWildlife Service, the Breeding Bird Survey uses annual

roadside counts along established routesfor monitoring of population changes of as many as,

or of more than 250 bird species,including 180 songbirds.

(A) for monitoring of population changesof as many as, or of

(B) to monitor population changes of asmany, or

(C) to monitor changes in the populationsof

(D) that monitors population changes of

(E) that monitors changes in populationsof as many as, or

为什么B 选项不是 as many as,or 而只是as many,or？

感谢大家~祝大家750+！

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