题目

 The manager promised to keep us ______ of how our business was going on. A. informed            B. informing         C. being informed         D. to be informed 答案： A  keep sb. informed of sth. 为固定搭配，意思为：使某人了解。若a，b，c∈R，且a＞b，则下列不等式一定成立的是A．B．C．D．