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GMAT Sentence Correction (SC) | Re: As algae spread in freshwater ponds and lakes, water quality

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jlgdr wrote:

Re answer choice E, do we ALWAYS need a comma after WHICH?

Thanks!
Cheers
J Image


Hey the right answer choice is C here.

Always Remember:
If the "which" is after a preposition, the comma is not required.
Else the comma is required always as which is the non essential modifier.


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