12. I called Hnnah many times yesterday evening, but I couldn’t get through. Her brother ______ on the phone all the time!

A. was talking         B. has been talking      C. has talked             D. talked

分析：答案为A。I called…和I couldn’t get through…用的都是一般过去时，而talk on the phone这一动作正是发生在I couldn’t get through…期间，故要用过去进行时。

13. The telephone ______, but by the time I got indoors, it stopped.

A. had rung               B. was ringing           C. rings                    D. has rung

分析：答案为B。根据句意可知，“电话铃响”这一动作在我进屋之前一直在进行，故用过去进行时。 

14. I walked slowly through the market, where people ______ all kinds of fruits and vegetables. I studied the prices carefully and bought what I needed.(www.nmet168.com)

A. sell                      B. were selling            C. had sold               D. have sold

分析：答案为B。根据句中的walked, studied, bought等可知，句子是在谈论过去的情况，故可排除A和D。再根据句意，联系“慢慢走过集市”“仔细研究价格”“买下需要的东西”等信息，说明当时人们是“正在”卖水果和蔬菜，故用过去进行时。

15. I wasn’t sure if he was really interested or if he ______ polite.

A. was just being       B. will just be           C. had just been         D. would just be

分析：答案为A。根据英语语法，动词be的过去进行时可以表示过去一时的表现或暂时的状态，本题的意思是：我不清楚他是真的感兴趣呢，还是装成有礼貌的样子。又如：

You were being stupid. 你当时真有傻。

She was being angry. 他当时显得很生气。

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