Look at the jubilant crowds on the news, tearing down the dictator's statues. The regime ______ finally collapsed.
must have
They had a clear opportunity to escape to freedom last night, but they were too afraid to take it. They ______ been free right now.
could have
He has spent his entire life fighting against state control. He ______ voluntarily given them his private data; it goes against everything he believes in.
couldn't have
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