--- it is from our own planet Earth to Mars!--- Yes, it takes months to travel to Mars by spacecraft.A. How soon B. How longC. How far D. How often 题目和参考答案——青夏教育精英家教网—

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---________ it is from our own planet Earth to Mars!

--- Yes, it takes months to travel to Mars by spacecraft.

A. How soon B. How long

C. How far D. How often

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