He didn't work hard and_________ he couldn't finish his task on time.[ ]

A. however          

B. consequently      

C. yet          

D. still

诊断肾结核最可靠的依据是（）

A.尿中找到抗酸杆菌

B.尿培养结核分枝杆菌阳性

C.尿中有大量脓细胞

D.附睾扪及结节

E.膀胱镜见到膀胱黏膜有溃疡、炎症