【题目】Having decided to go to Italy, we ________ booking the hotel immediately.
A. set off B. set up
C. set out D. set about
在线课程【答案】D
【解析】考查动词词组。A. set off出发，引起；B. set up建立；C. set out出发，开始；D. set about开始做。句意：决定了去意大利的时候，我们马上订了旅馆。set about doing sth.开始做某事，故答案为D。