——_________ should your robot need______
问题:
——_________ 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
——_________ 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