题目内容
选择填空:
-- May I sit here ?
[ ]
-- I'm afraid ______ .The chair is dirty.
A. you needn't B. you can
C. you can't D. you don't
－ Thanks a lot for your help.
－ ______
A. Don't say that. B. It's my duty.
C. You are welcome. D. I'm glad to hear that.
