—__________ 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
---Why not_____ us ?----Because I have a lot of work______.
#41178
A
to play; to do
B
play; to make
C
playing with; doing
D
play with; to do
My mother doesn’t know __________ this morning.
#40932
A
what to do
B
what does do
C
how to do
D
why does do
I don't know _______.Can you tell me________?
#40845
A
how swim; what to do
B
how to swim ; what to do it
C
how to swim; what to do
D
what to swim; how to do
——I don’t know ______ watch this is. Do you know? ——It might be Gao Lei’s.
#40811
A
who
B
whom
C
who’s
D
whose