Too high house prices can be brought under control　　　the authorities introduce a series of regulatory policies.

A．even if

B．as if

C．so that

D．provided that

局部麻醉时患者脸部出现暂时性瘫痪主要是由于哪种神经受到影响（）

A.上颌神经 

B.下颌神经 

C.面神经 

D.舌神经 

E.动眼神经