Final answer:
In George Orwell's '1984,' Winston committing a thought-crime by writing in his diary is true as the act is considered a form of dissent against Big Brother's totalitarian control.
Step-by-step explanation:
By writing in his diary, Winston has indeed committed a thought-crime in George Orwell's 1984. In the dystopian society depicted in the novel, the government, known as Big Brother, monitors its citizens' actions and thoughts incredibly closely to prevent any dissent or rebellion.
The very act of writing a diary, a place for personal thoughts and feelings, is an act of rebellion as it goes against the Party's desire to control every aspect of its citizens' lives, including their thoughts.
Therefore, the answer to the question is True.