The manager promised to keep us _____ ofhow our business was going on. informed B. informing C. to inform D. having informed

下列诗句中所使用的修辞手法，不同于其他三项的一项是( )

14Since the H1N1 flu is spreading, it’s necessary that whoever has a fever _________ to hospital as soon as possible

Having decided to rent a flat，we ________ contacting all the real estate agencies in the city．[ ]

It was ______ the old clock that the old man spent the whole morning at home.