单项选择题

A. Come onB. Take careC. Go aheadD. Hold on— May I open……

— May I open the window to let in some fresh air
—（）!

A. Come on
B. Take care
C. Go ahead
D. Hold on

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单项选择题What I need is （）book that contains （）ABC of oil painting.

A. a; 不填
B. the; 不填
C. the; an
D. a; the