题文
---________ it is from our own planet Earth to Mars!
--- Yes, it takes months to travel to Mars by spacecraft.
| A．How soon | B．How far |
| C．How long | D．How often |
---________ it is from our own planet Earth to Mars!
--- Yes, it takes months to travel to Mars by spacecraft.
| A．How soon | B．How far |
| C．How long | D．How often |
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