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---          a month do you do voluntary work ? ---Twice a month.
#59864
A
How long
B
How many times
C
How much
D
How often
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--- ________ under the tree?      --- No，they aren’t.　　   
#60372
A
Where are
B
What is
C
Are they
D
Is it
Is your photo in the drawer? ________.
#60374
A
Yes, I am
B
No，it is
C
Yes，it is
D
No，I’m not
－Julia, _________will your son return?－In a week.
#60040
A
how often
B
how far
C
how soon
D
how long
— _______ will you stay in Shenzhen for your summer vacation?— For about two weeks.
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How far
B
How often
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D
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--Were there any seals in the zoo?   ---________.
#60310
A
Yes, there weren’t
B
No, there weren’t
C
No, there were.
D
Yes, there was.