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
推荐题目
— __________ have you been to Taiwan?— Only once.
#60020
A
How often
B
How many times
C
How long
D
How soon
-- ________ does it take you to water the flowers?    
#60411
A
How 
B
What time
C
How long
D
How money
---Is this your basketball?---   ________.
#60150
A
Yes, it’s.
B
No, it’s not.
C
Yes, it is.
D
No, it is.