----Is this the first time you ________ to Harbin?

---- 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 come; came

地震中产生的横波所携带的能量相比于纵波来说，对建筑物的破坏更为严重。