-----Is this the first time you______ Chengdu?

-----No. But the first time I______ here, the city wasn’t so beautiful

A．visited; came

B．visited; have come

C．have visited ; have come

D．have visited; came

具有凉血止血作用的药物是（）

A.大蓟

B.小蓟

C.地榆

D.槐花

E.侧柏叶