The Smiths________through millions of ups and downs since they moved to Sydney. [ ]

A. have gone  

B. had gone  

C. went  

D. has gone

下列物质中各含有少量杂质，能用饱和Na₂CO₃溶液并借助于分液漏斗除去杂质的是（   ）

A．苯中含有少量甲苯　　

B．乙醇中含少量乙酸

C．乙酸乙酯中含有少量乙酸 　　

D．溴苯中含有少量苯