14．Mary went to the box office at lunch time，but all the tickets ________ out.
A．would sell B．had been sold
C．have sold D．was selling
答案 B [玛丽去售票处是一个过去的动作，而票全部售完发生在玛丽去售票处之前，因此是“过去的过去”，故用过去完成时。]
15．—Is Peter there?
—________，please.I'll see if I can find him for you.
A．Hold up B．Hold on
C．Hold out D．Hold off
答案 B [hold on意为“不要挂断，请等一会儿”，符合句意，其余选项均不是打电话时的用语。]
