The manager promised to keep me how our business was going on.A. informing ofB. informed o

问题补充：

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

答案：

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。