Section Ⅲ— Grammar
课后篇巩固探究
一、单句填空
1.They (quarrel) all the morning.
答案:have been quarrelling
2.I (prepare) for my birthday party.
答案:have been preparing
3.He (listen to) the English program since he came to the U.S.,so he has made great progress.
答案:has been listening to
4.The waiter (run) from this table to that table all the time.
答案:has been running
5.Since his assistant asked for a salary rise,he (complain) that the business is not good.
答案:has been complaining
