To me, cycling at ___ altitude of more than 4,000 meters was _____ unforgettable experience.
| A．the; an | B．an; an | C．/; a | D．an; / |
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To me, cycling at ___ altitude of more than 4,000 meters was _____ unforgettable experience.
| A．the; an | B．an; an | C．/; a | D．an; / |
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