第14题: [单项选择]I should have told you! You ______ the entire house. Our cleaning lady phoned she's coming tomorrow. 参考答案:B 答案解析:don't need to do sth.不需要做某事,needn't do sth.没有必要做某事。前者是普通动词,有时态、人称的变化;后者是情态动词,没有时态、人称的变化。根据题干,房间已经打扫完
参考答案:have people realized how important it is to be economical with water 答案解析:本题测试倒装句用法和现在完成时用法。当only和其所强调的状语部分放句首时,主谓需部分倒装。而时间状语里有recent时,谓语往往用现在完成时。