21.---What do you think of ________ concert last night?
---No doubt it was _______ great success.
A .a; the B. the; a C. the ; 不填 D. a; 不填
22.---Do you mind if I keep pets in this building?
---______.
A. I’d rather you didn’t, actually B. Of course not. It’s not allowed here.
C. Great. I love you. D. No, you can’t
