The manager promised to keep me how our business was going on.
A. informing of
B. informed of
C. to inform of
D. on informing
网友回答
A. informing of
(答案→)B. informed of
C. to inform of
D. on informing
解析：考查固定结构。Inform sb of sth通知某人某事；sb与inform构成被动关系，所以形成keep sb informed of sth通知某人某事；句意：经理答应通知我生意的进展情况。