If the weather had been better, we could have gone outing. But it ____ all day.

A．rains

B．has rained

C．had been rained

D．rained

咽后壁穿刺脓培养为金黄色葡萄球菌，耐甲氧西林金葡萄菌（MRSA）菌株，建议何种抗生素比较有效：（）

A.青霉素

B.丁胺卡那霉素

C.万古霉素

D.红霉素

E.头孢三嗪