For many years, ____ animals for carrying food and other supplies from one area to another has been a means of living in Xinjiang Autonomous Region .
| A．trained | B．training | C．having trained | D．to have trained |
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For many years, ____ animals for carrying food and other supplies from one area to another has been a means of living in Xinjiang Autonomous Region .
| A．trained | B．training | C．having trained | D．to have trained |
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