The time is drawing near ____the food rasied in space will directly benefit humans.The time is drawing near ____the food rasied in space will directly benefit humans.Awhere Bwhen Cwhether Dwhy
问题描述：
The time is drawing near ____the food rasied in space will directly benefit humans.
The time is drawing near ____the food rasied in space will directly benefit humans.
Awhere Bwhen Cwhether Dwhy
答