Sydney promised her that he would always do anything he could for her to ________ of her happiness.[ ]

A．making sure  

B．be sure

C．being sure  

D．make sure

有人把导游员称为“八大员”，并以此来形容导游工作的复杂性，请您从下列备选答案中选出哪些属于“八大员”的称呼（）

A、语言翻译员

B、生活服务员

C、对外调查员

D、旅途安全员

E、财务统计员