---          a month do you do voluntary work ? ---Twice a month. 
#59864
A
How long
B
How many times
C
How much
D
How often
推荐题目
----_____ going hiking tomorrow, Sandy? -----Good idea.
#60278
A
What about
B
Why not
C
Why don’t you
D
Would you
—_____will your sister be back ?—In about two hours.
#59910
A
How
B
How often
C
How long
D
How soon
--- Is this your bike? --- No,________It's________bike.
#60172
A
this isn't, Li Lei's
B
this is, Li Lei's
C
it isn't, Li Lei's
D
it is, Li Lei's
We don’t believe the baby is badly ill,__________?
#64523
A
do we
B
is he
C
is it
D
isn’t it