费解的英语题!Insects'ability to breed rapidly enables them to develop large populitions,____are pests.填of whom two-thirds 还是two-thirds of whom难题一定追加分!那为什么of whom two-thirds 不对呢?!到底是哪个?说明下原因

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费解的英语题!Insects'ability to breed rapidly enables them to develop large populitions,____are pests.填of whom two-thirds 还是two-thirds of whom难题一定追加分!那为什么of whom two-thirds 不对呢?!到底是哪个?说明下原因

费解的英语题!Insects'ability to breed rapidly enables them to develop large populitions,____are pests.填of whom two-thirds 还是two-thirds of whom难题一定追加分!那为什么of whom two-thirds 不对呢?!到底是哪个?说明下原因
费解的英语题!
Insects'ability to breed rapidly enables them to develop large populitions,____are pests.
填of whom two-thirds 还是two-thirds of whom
难题一定追加分!
那为什么of whom two-thirds 不对呢?!
到底是哪个?说明下原因吧,谢谢了!

费解的英语题!Insects'ability to breed rapidly enables them to develop large populitions,____are pests.填of whom two-thirds 还是two-thirds of whom难题一定追加分!那为什么of whom two-thirds 不对呢?!到底是哪个?说明下原因
two-thirds of whom