Explanation :
<p data-start="0" data-end="29">The correct preposition is:</p> <p data-start="31" data-end="45"><strong data-start="31" data-end="41">βuponβ</strong> β </p> <p data-start="47" data-end="203">π Full sentence: <em data-start="65" data-end="201">βAs they navigated through the dense forest, they stumbled <strong data-start="125" data-end="133">upon</strong> an ancient ruin that was hidden beneath the overgrown vegetation.β</em></p> <p data-start="205" data-end="263">(<em data-start="206" data-end="220">Stumble upon</em> = to find/discover something by chance.)</p>
Correct Answered :
Wrong Answered :