CEOs from Apple, Amazon, Google, and Facebook had to defend their companies against what lawmakers called 'a pattern of' monopolistic behavior. Here's how each was grilled during Wednesday's landmark hearing. (AMZN, GOOGL, AAPL, FB)

· Wednesday's tech antitrust hearing was a grueling six-hour event in which House committee members grilled Jeff Bezos, Tim Cook, Mark Zuckerberg, and Sundar Pichai about their companies' market power. 
· Cook, Apple's CEO, received what seemed like the fewest questions, but he was asked about the App Store and how Apple...