When Sergey Brin and Larry Page started their business, they had no idea that it would become a global leader in the industry.

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When Sergey Brin and Larry Page started their business, they had no idea that it would become a global leader in the industry. (*) compound-complex (*) compound (*) complex (*) simple

This is a companion discussion topic for the original entry at https://english.best/questions/939,when-sergey-brin-and-larry-page-started-their-business-they-had-no-idea-that-it-would-become-a-global-leader-in-the-industry/