16. A county airport, designed to serve the needs of private aircraft owners, planned to cover its operating expenses in part by charging user fees to private aircraft using the airport. The airport was unable to pay its operating expenses because the revenue from user fees was lower that expected.
If the statements above are true, which one of the following must also be true?
(A) Most of the country's citizens live a convenient distance from one or another airport now offering commercial airline services.
(B) Private aircraft owners were unwilling to pay the user fees charged at the airport
(C) The airport's construction was financed exclusively by private funds
(D) The airport's operating expenses were greater than the revenues raised from sources other than the airport user fees for private planes
(E) The number of owners of private aircraft who use the county's airport facilities will not change appreciably in the future
答案：D
我选的是B，B的错误是不是原文没有提到owners were unwilling? 那D是如何得出的呢？
谢谢！
Original passage: operating expenses < (revenue from user fee + revenue from other sources)
Obviously, D, operating expenses < revenue from other sources, is correct.
明白了，要盈利，operating cost must < user fee + other sources。
但如果operating cost < other sources，无论有没有user fee，都是able to pay的。
所以，结论是unable to pay, operating cost >other sources, as C said.
thanks!
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