Environmentalist and economist

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Source: — Sentence Correction |

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by kanha81 » Tue Apr 28, 2009 3:58 pm
Here's my reasoning [spoiler][A][/spoiler]

A- The reason it is correct answer is because it keeps the meaning of the sentence intact. It is rich nations who have joined...
B- This changes the meaning of the sentence as soon as it says "that for maintaining the effectiveness, rich nations join"...It's implying rich nations to join..
C- wanting is not the right way of putting this into the sentence
D- same as C
E- same as C & D
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