高考英语单项选择 时态

高考英语单项选择 时态
3.As you can see, the number of cars on roads ______ rising these days. （06全国卷Ⅱ）
A. was keeping B. keepC. keepsD. were keeping
答案 C 为什么不选A
26.This machine ______ , It hasn’t worked for years . （06浙江卷）
A. didn’t work B. wasn’t workingC. doesn’t work D. isn’t working
答案c 为什么不选d
31.I ______in London for many years,but I’ve never regretted my final decision to move back to China. （06重庆卷）
A. lived B. was livingC. have livedD. had lived
答案A 为什么不选c
28.My friend, who ____ on the International Olympic all his life , is retiring next month. （06浙江卷）
A. served B. is serving C. had served D. has served
答案 D 为什么不选a