题文
During the charity walk, people have to walk_____ country parks and_____ hills and mountains.
| A．over, through | B．through, on |
| C．through, over | D．in, on |
During the charity walk, people have to walk_____ country parks and_____ hills and mountains.
| A．over, through | B．through, on |
| C．through, over | D．in, on |
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