Gary Locke , a Chinese-American, once______ as the governor of Washington for 8 years and now is U.S. Commerce Secretary．

A．had worked

B．worked

C．is working

D．has been working

婴幼儿化脓性脑膜炎最常见的细菌是

A．肺炎链球菌

B．大肠杆菌

C．葡萄球菌

D．溶血性链球菌

E．铜绿假单胞菌