传染性单核细胞增多症早期继发链球菌感染时应忌用哪种抗生紊
A．氨苄青霉素B．红霉素C．氯霉素D．庆大霉素E．克林霉素
参考答案：A
-What are you doing?
-I'm ____ the key to the door. [ ]
A. finding out
B. looking after
C. looking for
直流反接
