6. In the wake of September 11, ______ in the USA, many airline employees have been laid off.
(A) breakdowns
(B) defeats
(C) knocks
(D) attacks

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統計： A(3), B(1), C(0), D(8), E(0) #3374949

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題目解析 題目提到「在九一一事件之後，...
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