问题
选择题
You must keep us ______ of how things are going here.
A．informing
B．informed
C．inform
D．to inform
答案
答案：B
题目分析：考查固定搭配。inform sb of sth通知某人某事；inform sb to do sth/that通知某人做某事；keep sb informed of sth让某人知晓......。句意：你必须让我们知晓事情的发展状况。故选B。