Barack Obama delivered a speech to 500 local youths during his visit to China，many of were from Fudan University and Tongji University．
| A．them | B．whom | C．which | D．those |
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Barack Obama delivered a speech to 500 local youths during his visit to China，many of were from Fudan University and Tongji University．
| A．them | B．whom | C．which | D．those |
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