Theremusthavebeensomeonewhohasinstigatedarebellionbecausethepeoplearesowellorganized.

参考答案:

A

动词辨析, instigated鼓动；A. incited激动，偏动；B. tampered干预，玩弄，贿赂，损害，削 弱，篡改；C. intruded; 闯入，侵入，把（自己的思想）强加于人；D. meddled管闲事； 因此A为答案。