---          a month do you do voluntary work ? ---Twice a month. 
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A
How long
B
How many times
C
How much
D
How often
推荐题目
There used to be a temple in your village,________?
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A
used there
B
usedn't there
C
did there
D
didn't it
–Alice, feed the bird today, _____?--But I fed it yesterday.
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A
do you
B
don’t you
C
didn’t you
D
will you
—— ___________ do you have this kind of match? —— Once a year.
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A
How long
B
How often
C
How many
D
How much