14. As new threats were reported, the airport ________ procedures that included stricter guidelines on passenger and
luggage screening.
(A) collected
(B) implemented
(C) canceled
(D) conspired
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統計: A(2), B(75), C(13), D(7), E(0) #1573217
統計: A(2), B(75), C(13), D(7), E(0) #1573217