gwd11-40请教这道题的答案

Q40:

Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A.      not produced by the accepted methods of ore formation but that swarms of microbes over millions of years

B.       not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that

C.       not produced by the accepted methods of ore formation but swarms of microbes over millions of years that

D.      produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years

E.       produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

answer is A, my answer is D, please confirm

同一，

同意是D

I think something is wrong with the phrase D.

Please look at the rewrtten sentence below:

Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but by swarms of microbes that concentrated the gold from jungle soils and rivers and rocks over millions of years.

The sentence above should be correct now.

Anybody have anything to say?

你的意思可能是觉得应该用完成时态。但是请注意完成时态的的时间状语标志：

whin / during / over / in  + the past / last / recent + 时间短语 ，这里少了红字部分。