问题
选择题
Mary went to the box office at lunch time, but all the tickets ____out.
A．would sell
B．had sold
C．have sold
D．was selling
答案
答案：B
考查动词时态。上句went to为过去时，而所有的票卖完发生在去之前，故表示过去的过去用过去完成时。
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