搜题，就来5TiKU.com题库【问题】 — Space travel must be very very expensive.— . The cost of a seat on the Virgin craft is $ 250,000
— Space travel must be very very expensive.— . The cost of a seat on the Virgin craft is $ 250,000
正确答案：B.Of course.
题目解析：本题出自郑州大学，国家开放大学理工英语4，由丰阳塔题库搜集整理。
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