She insisted on _____ leaving the house.

insist on এর পরে সাধারণত possessive pronoun বসে; তাই verb এর ing form (leaving) এর আগে his বসবে।

সঠিক বাক্য: She insisted on his leaving the house.

Insist on/upon = to keep doing something, even if it annoys other people, or people think it is not good for you. বাংলায়, কোনো কিছুতে জোর দেয়া বা পীড়াপীড়ি করা। Insist on/upon এর সাথে verb এর ing form বসে।