Hong Kong ______ to China in 1997
-
has reverted
-
reverted
-
is reverting
-
revert
B
Correct answer
Explanation
Past simple is used for completed actions at a specific time in the past. 'Reverted' correctly describes Hong Kong's return to China in 1997. 'Has reverted' would need a time reference, 'is reverting' is ongoing, and 'revert' lacks tense.