高中语法动词的时态和语态
问题描述：
高中语法动词的时态和语态
the manager was worried about the press conference his assistant ____ in his place but,luckily,everything was going on smoothly.
A gave B gives C was giving D had given
选c,为什么不选d?如何翻译?
答
过去完成时态,表示过去的过去,在这里是先担心,而空中动作不是发生在主句谓语之前,所以不用D