—Two hundred of the tourists were saved from danger in Taiwan, but the rest still missing．
— If only the travel agency more measures to prevent such accidents．
A. is; has taken
B. are; had taken
C. is; took
D. are; would take
网友回答
A. is; has taken
(答案→)B. are; had taken
C. is; took
D. are; would take
解析：第一空考查主谓一致，the rest做主语，谓语和the rest修饰的名词决定，这句话指的是tourists，用are，第二空考查虚拟语气，If only+宾语从句，从句中的谓语用相应的过去时，这句话指的是旅行社过去要采取措施就好了，用过去完成时。选B。