As far as we know, half of Canadian teenagers do not get enough sleep on school

题干

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

上一题下一题 0.4难度单项选择更新时间:2012-07-20 10:21:24

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