why do something做某事没有必要

2.      【2007海南】 ---It’s a long time since I saw my sister. 
---_______________ her this weekend?
A. Why not visit       B. why not to visit   
C. Why not visiting    D. Why don’t visit

考点3.         I’m sorry, but…; Thanks, but…

3.      【2004全国III】 I hope you don’t mind me asking, _______ where did you buy those shoes?
A. so   B. and   C. yet  D. but

4.      【2005重庆】— We missed you at this morning's meeting, Diana.
—_____, but if I hadn't had to meet a friend, I would have been there.
A. Me. too        B. I’m sorry     
C. Never mind     D. Thank you

5.      【2007江西】—Will you join us in the game?
   —Thank you, _____.
A. but why not?  B. but I’d rather not. 
C. and I won’t    D. and I’ll join.

6.      【2008山东】— Say, Jane, will you come with me to the game Friday?
—______, Bob, but I promised Mary I'd go with her.
A. My pleasure      B. Thanks    
C. Take it easy         D. Forget it

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