对more than 6 million years 如何提问句子:The last dinosaurs died (more than 6 million years ago).(对括号内部分提问),

问题描述:

对more than 6 million years 如何提问
句子:The last dinosaurs died (more than 6 million years ago).(对括号内部分提问),

WHEN did the last dinosurs die?