Are you paying now, or shall I ＿＿＿＿＿＿ to you?
A. book it down
B. book it in
C. book it up
D. book it out
网友回答
(答案→)A. book it down
B. book it in
C. book it up
D. book it out
解析：book down ＝ put down in a book，意为“记账”；book in的意思为“签到，登记”；book up意为“预定座位或车、船票”等。