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：答案為A。I called…和I couldn’t get through…用的都是一般過去時，而talk on the phone這一動作正是發生在I couldn’t get through…期間，故要用過去進行時。

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：答案為B。根據句意可知，“電話鈴響”這一動作在我進屋之前一直在進行，故用過去進行時。 

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：答案為B。根據句中的walked, studied, bought等可知，句子是在談論過去的情況，故可排除A和D。再根據句意，聯系“慢慢走過集市”“仔細研究價格”“買下需要的東西”等信息，說明當時人們是“正在”賣水果和蔬菜，故用過去進行時。

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：答案為A。根據英語語法，動詞be的過去進行時可以表示過去一時的表現或暫時的狀態，本題的意思是：我不清楚他是真的感興趣呢，還是裝成有禮貌的樣子。又如：

You were being stupid. 你當時真有傻。

She was being angry. 他當時顯得很生氣。

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