Definition: used when you are extremely surprised, confused, or angry about something Level: C1
你之前究竟为什么没告诉我？
___Why ___on ___earth didn't you tell me before?
你究竟怎么能有一辆没有厕所的马车？
___How ___on ___earth can you have a coach without a toilet?
你究竟在这里做什么？
___What ___on ___earth are you doing here?
