阿摩線上測驗
27 Pilot organizations deploying a Portable Pilot Unit should make sure the systems they use are _____ in good
working order.
(A) prevented
(B) protracted
(C) maintained
(D) manipulated
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統計： A(10), B(12), C(79), D(12), E(0) #3118480
統計： A(10), B(12), C(79), D(12), E(0) #3118480
