He stood up,      the large door and looked outside. There on the ground lay a white dog.

A．opens

B．opened

C．opening

D．having opened

回归热尿检时可发现（）。

A.红细胞阴性

B.管型阳性

C.螺旋体阳性

D.蛋白阳性

E.白细胞阳性