下列属于抑菌剂的抗菌药为（）
A.磺胺类
B.大环内酯类
C.氯霉素类
D.四环素类
E.氨基糖苷类
参考答案：A, B, C, D
We are satisfied with his job in our company. Everything goes better now than when he his work here.
A．has started
B．would start
C．started
D．had started
（ ）
