She showed the visitors around the museum, the construction ________had taken more than three years.(2011·江西)

A．for which

B．with which

C．of which

D．to which

下列哪种情况下氧解离曲线右移（）。

A.肺通气阻力减少

B.代谢性碱中毒

C.2，3-二磷酸甘油增多

D.血温降低

E.血二氧化碳分压下降