It takes 10-12 days ____ from the Earth to the Moon ____ rocket.
| A．to travel, by | B．traveling, on |
| C．travel, on | D．traveling, by |
It takes 10-12 days ____ from the Earth to the Moon ____ rocket.
| A．to travel, by | B．traveling, on |
| C．travel, on | D．traveling, by |
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