---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 |
---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 |
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