--_________ should your robot need_________ batteries?--Every two months.[ ]A. How soon to be chang

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--_________ should your robot need_________ batteries?    

--Every two months.

[    ]

A. How soon, to be changed            

B. How long, to change    

C. How much, change                

D. How often, to change

热搜:关于氨基酸代谢错误的论述是_________。