一When did you learn the news that Obama made a trip to Canada as President?一 was on my return．
| A．That |
| B．It |
| C．There |
| D．This |
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一When did you learn the news that Obama made a trip to Canada as President?一 was on my return．
| A．That |
| B．It |
| C．There |
| D．This |
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