【题目】Hotel owners ______ to find new ways of attracting tourists since the sudden drop in tourism last year.
A. force B. have forced
C. are forced D. have been forced
在线课程【答案】D
【解析】考查时态和语态的用法。句意：自从去年旅游业突然滑坡以来，宾馆主人已经不得不找到吸引游客的新方法。根据题干中的since短语可知应用现在完成时，句子的主语是force的动作承受者，应用完成被动语态。故选D。