关于帕金森病的3个主要体征，下列各项中，哪项是正确的（）

A.震颤、肌张力增高、慌张步态

B.震颤、面具脸、肌张力增高

C.运动减少、搓丸样动作、肌张力增高

D.震颤、肌张力增高、运动减少

E.震颤、面具脸、运动减少

Mary failed the driving test again．If she ______ harder, she ______ the test easily．

A．practiced; would pass

B．had practiced; would pass

C．had practiced; would have passed

D．should practice; should have passed