China Business Daily reported the 60% discounts on some Beijing-shanghai flights have now slipped back to 20% _______ one day in advance.
| A．when books | B．when to book | C．when booking | D．when booked |
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China Business Daily reported the 60% discounts on some Beijing-shanghai flights have now slipped back to 20% _______ one day in advance.
| A．when books | B．when to book | C．when booking | D．when booked |
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