一题求教

ninaluan

in the main, incidents of breakdowns in nuclear reactors have (not resulted from lapses of high technology but) commonplace inadequacies in plumbing and wiring.

B. resulted not from lapsesd high technology but from

E. resulted not from lapses of high technology but have stemmed from
E为什么不对？

lyricling

这里not....but是一对连接平行结构的连词，所以not 之后的成份应该与but 之后的成分在形式上对称，功能上一致。而E项，你看看，not 之后的from(介词词组) 能与but 之后的have stemmed from （谓语动词）对称吗？