新东方材料279页第152题（全文划线）

yue_1100

152. Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.

A) Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.

B) If used repeatedly in the same place, one reason that certain pesticides can become ineffective is suggested by the finding that much larger population of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.

答案是A，但是不太理解B为什么错了，是改变语意了吗？

提前谢过~~~~

icepipi

one reason 被 used repeatedly? 如果选B的话

yue_1100

以下是引用icepipi在2007-11-22 16:23:00的发言：
one reason 被 used repeatedly? 如果选B的话

多谢！确实容易比A产生一些误解。