XDF-14 请教!

At a recent conference on environmental threats to the North Sea, most participating countries favored uniform controls on the quality of effluents, whether or not specific environment damage could be attributed to a particular source of effuent, what must, of course be shown , in order to avoid excessively restrictive controls, is that____

A)..

B) any substance to be made subject to controls can actually cause envornmental damage

C)..

D) all of any given pollutant that is to be controlled actually reaches the North Sea at present

I would like to know how can we exlude D, I think both B and D are right.

请MM注意， whether or not specific environment damage could be attributed to a particular source of effuent, what must, of course be shown , in order to avoid excessively restrictive controls,这几句中的红色字对解本题是至关重要的。

而D)all of any given pollutant that is to be controlled actually reaches the North Sea at present 中的这些状语使得D肯定不对的。现在没 reaches the North Sea 也许reaches the North Sea just tomorrow.

thank y howardwan GG, you made that crystal clear to me, now I see why D is not right

Thanks

you are wellcome.

if what i did has made you get it, i will be happier than you.