More teens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.
| A．which | B．when | C．where | D．that |
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More teens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.
| A．which | B．when | C．where | D．that |
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