—__________ do I have to change the robot’s batteries? —Every two months.
#41136
A
How long
B
How soon
C
How often
D
How many
推荐题目
I  ______any water ______ bread in the fridge.
#41108
A
don’t have, and
B
have, and
C
don’t have, or
D
am not have, or
There is ________ with my computer. It doesn’t work now. 
#41255
A
nothing wrong
B
something wrong
C
wrong something
D
wrong nothing
 Our teacher found her ___ and gave her some different homework to do every day. 
#40837
A
was clever
B
was a clever girl
C
clever girl
D
a clever girl