（2013·北京卷) If we a table earlier, we couldn’t be standing here in a queue.
| A．have booked | B．booked | C．book | D．had booked |
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（2013·北京卷) If we a table earlier, we couldn’t be standing here in a queue.
| A．have booked | B．booked | C．book | D．had booked |
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