问题描述：
yang liwei is the first chinese gengrally considered ___ in space.
yang liwei is the first chinese gengrally considered ___ in space.
A.to have travelled B.travel C. having traavel D.to travel
选什么?为什么?
yang liwei is the first chinese gengrally considered ___ in space.
A.to have travelled B.travel C. having traavel D.to travel
选什么?为什么?
问题解答：
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