Declining revenues resulting from a decrease in business travel, a source of income without which most commercial airlines could not survive, are going to force many commercial airlines to increase prices and decrease services in the coming months
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Aa source of income without which most commercial airlines could not survive, are
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Ba source of income without which most commercial airlines could not survive, is
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Cand most commercial airlines use it as a source of income to survive with, are
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Dwhich is a source of income which is needed by most commercial airlines who could not survive without it, are
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Ewhich most commercial airlines use as a source of income without which they are unable to survive, is
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正确答案: A