—Can I call on her next week?

—Yes, if ________.[ ]

A. you are convenient

B. you will be convenient

C. it is convenient to you

D. it will be convenient to you

治疗肺炎球菌肺炎的首选药物是

A．磺胺类药物

B．青霉素G

C．四环素

D．庆大霉素

E．阿米卡星