诊断病毒性脑膜炎惟一可靠的方法是()

A．PCR检查脑脊液中的病毒

B．有无头痛

C．有无脑膜刺激征

D．血清或脑脊液中病毒抗体滴度的增高

E．病毒分离和组织培养

He used to ________ cards, but now he is used to ________ a walk after supper.   [ ]

A. play; taking    

B. playing; take    

C. play; take           

D. playing; taking