PPSC Past Paper Care Taker BS-14 (L&HR) 2019 Solved MCQs, General Knowledge MCQs, PPSC Solved Past Papers MCQsThe cleanest river in the world? Posted on April 16, 2021 by Rana TahirA. River Elbe B. River Thames C. River Indus D. All of theseShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)