问题描述：
Excuse me,sir.Is the swimming pool open all day?--- _____.Only from 6:30pm to 9:30 pm.
A Yes,of course
B That is right
C Sorry,I am not sure
D Soryy,I am afraid not
A Yes,of course
B That is right
C Sorry,I am not sure
D Soryy,I am afraid not
问题解答：
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