1.China has set foot ___ space.A.in B.on

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1.Chinahassetfoot___space.A.inB.on1.Chinahassetfoot___space.A.inB.on1.Chinahassetfoot___space.A.inB.

1.China has set foot ___ space.A.in B.on
1.China has set foot ___ space.A.in B.on

1.China has set foot ___ space.A.in B.on
A.宇宙空间是广大而虚无的,所以用in.