问题补充：
--Excuse me, could you please shout in the classroom?
--Sorry! I will keep quiet from now on.
A. don’t
B. not
C. not to
D. didn’t
答案：
A. don’t
(答案→)B. not
C. not to
D. didn’t
解析：could you please do sth ?请做···好吗？有礼貌的请求。否定形式是could you please not do sth ?请不做···好吗？句意：请不要在教室里大喊好吗？故选B
