We lost our way in that small village, otherwise we ________ more places of interest yesterday.[ ]

A. visited  

B. had visited

C. would visit  

D. would have visited

下列跟氧气和臭氧的关系相同的一组物质是（　　）

A．¹²C和¹⁴C

B．氯气和氯水

C．乙醇和酒精

D．H₂和H₃