23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.
The argument depends on which one of the following assumptions?
A. More than one or two airplanes were scheduled for the nine canceled flights.
B. Swift Airlines has fewer mechanical problems than do other airlines of the same size.
C. Each of the canceled flights would have been longer than the average flight on Swift Airlines.
D. Swift Airlines had never before canceled more than one or two scheduled flights on a single day.
E. All of the airplanes scheduled for the canceled flights are based at the same airport.
我实在是没看懂题目，各位能不能帮忙翻译一下啊？万分感谢啊
某一天,SA的九次航班都被取消了.一般而言,一次航班的取消是因为该次航班飞机的机械故障的原因.
然而,在一天之内不太可能超过1到2次的航班都是因为飞机的机械故障而取消的,所以说九次航班的取消
除了机械故障一定还有其他原因.
答案是a,也就是说这九次航班必然不仅仅是计划1或者2架飞机飞的,如果是计划某1架飞机飞的九次航班,
那么这和题干中的前提也就是"一天之内不太可能超过1到2次的航班都是因为飞机的机械故障而取消的"矛盾,因为在这种情况下这架飞机肯定是那架发生机械故障的飞机了.
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