—How ___ is it from Xi’an to Dunhuang?—It’s less than 3 ___ flight.
| A．long, hour’s | B．far, hour’s |
| C．long, hours’ | D．far, hours’ |
—How ___ is it from Xi’an to Dunhuang?—It’s less than 3 ___ flight.
| A．long, hour’s | B．far, hour’s |
| C．long, hours’ | D．far, hours’ |
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