77. Augmented reality (AR) and virtual reality (VR) are technology adopted to aid human in learning and training. For a pilot training, before he or she is allowed to navigate an expensive airplane for a real mission, the technology of ______ , will be more suitable for the training.
(A) AR
(B) VR
(C) both of the above
(D) none of the above

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統計： A(4), B(24), C(7), D(1), E(0) #2929654