单项选择题

《国务院办公厅关于大力发展装配式建筑的指导意见》（国办发[2016]71号）中明确指出：大力发展装配式建筑，以下哪个区域不属于重点推进区( )。
A、京津冀。
B、长三角。
C、珠三角。
D、成渝双城经济圈。

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