—When did the terrible earthquake happen in Ya’an Sichuan？
—It happened ________ 8:02 ________ the morning of April 20th，2013．
| A．on；in |
| B．at；on |
| C．at；in |
| D．on；on |
—When did the terrible earthquake happen in Ya’an Sichuan？
—It happened ________ 8:02 ________ the morning of April 20th，2013．
| A．on；in |
| B．at；on |
| C．at；in |
| D．on；on |
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