It’s not easy for trailwalkers to finish walking a__ trail within 48 hours.
| A．100-kilometre | B．100-kilometres |
| C．100 kilometres | D．100 kilometres’ |
It’s not easy for trailwalkers to finish walking a__ trail within 48 hours.
| A．100-kilometre | B．100-kilometres |
| C．100 kilometres | D．100 kilometres’ |
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