International airlines have rediscovered the business travelers, the man or woman who regularly jets from country to country as

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问题     International airlines have rediscovered the business travelers, the man or woman who regularly jets from country to country as part of the job. This does not【C1】______mean that airlines ever abandoned their business travelers.【C2】______. companies like Lufthansa and Swissair would rightly argue that they have always【C3】______best for the executive-class passengers.【C4】______many lines could be accused of concentrating too heavily in the recent past【C5】______attracting passengers by volume, often at the【C6】______of regular travelers. Too often, they have seemed geared for quantity【C7】______than quality.
    Operating a major airline in the 1980s is essentially a(n) 【C8】______of finding the right mix of passengers. The airlines need to fill up the back end of their wide-bodied jets with passengers paying a【C9】______fare, without forgetting that the front end should be filled with people who pay【C10】______more for their tickets.
    It is no【C11】______that the two major airline bankruptcies in 1982 were among the companies【C12】______in cheap flights. But low fares require consistently full aircraft to make flights economically viable(可行的), and in the recent recession the【C13】______of traffic has not grown. Equally the large number of airlines jostling(争夺)for the【C14】______passengers has created a huge excess of capacity. The net result of excess capacity and cutthroat【C15】______driving down fares has been to push some airlines into【C16】______and leave many others hovering on the【C17】______.
    Against this grim background,【C18】______is no surprise that airlines are【C19】______increasingly to the business travelers to improve their rates of return. They have【C20】______much time and effort to establish exactly what the executive demands for sitting apart from the tourists.
【C18】

选项 A、this
B、which
C、as
D、it

答案D

解析 结构衔接题。通过分析句子结构可知,that引导的句子成分完整,是一个后置的主语从句,本空应填一个词充当形式主语,只有[D]it能充当形式主语,故答案为[D]。真正的主语是that引导的句子。此处是说,面对这种严峻的形势,航空公司转向商务乘客来提高回报率也就不足为奇了。
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