Flying on a plane can cost a lot of money. Now is a good time to buy plane tickets at a low price. Many airlines(航空公司)are sellin

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问题     Flying on a plane can cost a lot of money. Now is a good time to buy plane tickets at a low price. Many airlines(航空公司)are selling【C1】______tickets.
    A woman from a news station says that there are good【C2】______now. But she also says that you【C3】______be careful. You need to be sure【C4】______you really want these tickets before buying them. If changes need【C5】______it will cost a lot of money. You also need to【C6】______your tickets before the middle of December.
    The【C7】______will not lose any money【C8】______selling these cheap tickets. They believe that many people will buy【C9】______. They will sell【C10】______tickets now because they cost less money.
【C4】

选项 A、what
B、that
C、which

答案B

解析 本题考查的是宾语从句。be sure表示确定,确保。根据句子意思来看,记者建议大家买廉价机票之前要确定自己真的需要这些机票,是普通的陈述句,因此可以使用that作为从句引导词。故B正确。
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