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 |
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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 |
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