第28题: [单项选择](On her way) to the supermarket yesterday morning, Mary (met) an old friend and (stopped talking) with him for (quite a while). A. On her way B. met C. stopped talking C. quite a while 参考答案:C 答案解析:[解析] 动词短语用法错误,应改为stopped to talk。stop to do“停下来去干另外一件事”;stop doing“停止正在做的事情”,句中是说玛丽停下来和她的老朋友说话。
第29题: [单项选择]Had the governments and scientists not worked together , AIDS-related deaths()since their highest in 2005. A. had not fallen B. would not fall C. did not fall D. would not have fallen 参考答案:D