is that possible to fly to the moon in a spaceship?为什么用that 而不是now,man,it?

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• is （ ） possible to fly to the moon in a spaceship?A it B that C man D now 说下原因
• is that possible to fly to the moon in a spaceship?为什么用that 而不是now,man,it?
• is （ ） possible to fly to the moon in a spaceship?A it B that C man D now 说下原因
• is that possible to fly to the moon in a spaceship?为什么用that 而不是now,man,it?
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• Light is the fast thing in the world,the speed of which is 300.000 kilometers per second.Light is the fast thing in the world,whose speed（the speed of which）is 300.000 kilometers per second.为什么不是the speed of whose 就像a friend of mine 不是对应上面的whose吗?那为什么不一样呢?