You must keep us ______ of how things are going here.
A．informingB．informedC．informD．to inform
B

試題分析：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讓某人知曉......。句意：你必須讓我們知曉事情的發(fā)展狀況。故選B。
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