---- It is the second time that I _________ to Shanghai.

----- What great changes! It’s ten years since I _______ there last time.

A．have been; went

B．had been; went

C．am; had been

D．come; had been

常用于眼球消毒的药物是______。

A．过氧化氢溶液
B．高锰酸钾溶液
C．硼酸溶液
D．高渗氯化钠溶液
E．酒精