—Why didn't you come to the cinema with us last Saturday?

—Oh, sorry. But I________ the film.[ ]

A. see  

B. saw  

C. have seen  

D. had seen

盛有氯化钡稀溶液的甲、乙两试管中分别通入SO₂至饱和，若向甲试管中加入足量硝酸，乙试管中加入足量氢氧化钠溶液，则下列叙述正确的是[ ]

A．甲、乙两试管都有白色沉淀生成

B．甲、乙两试管都没有白色沉淀生成

C．甲试管没有白色沉淀生成而乙试管有

D．甲试管有白色沉淀生成而乙试管没有