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单选题
All flights _____ because of the storm, they decided to take the train.
A
having cancelled
B
were cancelled
C
have been cancelled
D
cancelled
参考答案
参考解析
解析：
句子的两个部分中间是逗号，且后面的部分是完整的句子，所以前面的句子应该是不完整的，排除B、C。根据句意可知“航班已经被取消”，应该用被动完成式，用分词的独立主格作状语表示原因。故为D。
句子的两个部分中间是逗号，且后面的部分是完整的句子，所以前面的句子应该是不完整的，排除B、C。根据句意可知“航班已经被取消”，应该用被动完成式，用分词的独立主格作状语表示原因。故为D。
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资料：Everyone knows airline pricing is based on supply and demand. Fares are more expensive during peak travel seasons like summer and to prime destinations like European capitals. So if a flight to Rome costs more than a flight to Milan, you'd think that demand for Rome must be higher or supply lower.
What's puzzling is that you can pay a high price to a given destination but a dramatically lower price for the exact same flight if you agree to go on to another destination.
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Airlines have increased their profitability in recent years by segmenting the market for air travel and charging customers different prices for the same product. In this case, the market is segmented based on demand for direct flights. Airlines know most people prefer the shortest route to their destination, so they make customers pay up for the privilege of flying direct. （They also make it a little more inconvenient if you don't pay up for a direct flight, in order to encourage you to fly direct.）
When prices become so obviously illogical, it may be time to revisit why air tickets can't be transferred or resold just like any other normal product. If the airlines are entitled to exploit the free market, shouldn't customers be allowed to do the same thing?
Why may prices for direct flights be higher according to the passage?A.Because all people prefer the shortest route to their destination.
B.Because airlines take advantage of people’s preference for direct flights.
C.Because connecting flights may cause some inconvenience.
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