急性感染性心内膜炎的病原微生物下列选项中最常见：（）
A.金黄色葡萄球菌
B.肺炎球菌
C.表皮葡萄球菌
D.A族链球菌
E.衣原体
参考答案：A
(2013·新课标Ⅱ，10)It was only after he had read the papers________Mr.Gross realized the task before him was extremely difficult to complete.
A．when
B．that
C．which
D．what
顶
