一Did they take any photos? 一______．
#59967
A
No，they didn't
B
No，they did
C
No，they aren't
D
No，they weren't
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As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?
#64802
A
do they
B
don’t they
C
don’t you
D
isn’t it
Tom hardly had time for concerts at that time, ________？
#64782
A
wasn't he
B
was he
C
did he
D
didn't he
---Lily, how long __________ the Football Club? ---Since two months ago.
#60272
A
you have joined
B
have you joined
C
you have been in
D
have you been in