Hi mukherjee.tanuj3,
The word "so" can appear in a "2-part" phrase as you've noted. Here though, the word "so" is used for emphasis (similar to the word "very").
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Source: Beat The GMAT — Sentence Correction |
here the construction is used in the sense "so X that Y" .its just that the construction has been reversed . we can read the sentence as --->the river has become so polluted that the project must be abandonedThe word "so" can appear in a "2-part" phrase as you've noted. Here though, the word "so" is used for emphasis (similar to the word "very").














