问题
选择题
---Do you know___________ in Ya’an? --- On the 20th of April，2013.
A．how many people died in the earthquake
B．how many days the earthquake lasted
C．when the earthquake happened
D．when did the people die
答案
答案：C
题目分析：句意：你知道雅安地震是什么时候发生的吗？2013年4月20日。答语是时间，应该选择由when 引导的宾语从句，要用陈述语气。故选C。