The river becomes rapid as it passes __________ deep valleys, travelling __________ western Yunnan Province.
| A．over; through | B．through; across |
| C．across; through | D．through; over |
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The river becomes rapid as it passes __________ deep valleys, travelling __________ western Yunnan Province.
| A．over; through | B．through; across |
| C．across; through | D．through; over |
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