单选题 The president promised to keep all the board members ______ of how the negotiations were going on.
A. informed B. be informed
C. inform D. informing

【正确答案】 A
【答案解析】[解析] 分词的逻辑主语为all the board members，与分词成被动关系。因此，用过去分词作宾语补足语。