问题
选择题
As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?[ ]
A. do they
B. don't they
C. don't you
D. isn't it
答案
答案：A
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As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?[ ]
A. do they
B. don't they
C. don't you
D. isn't it
答案：A