Black boxes,_____to record flightdata together with pilots' conversation and noises from theaircraft,are important for people to find out the cause of an aircra-高中英语-n多题

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Black boxes, _____ to record flightdata together with pilots' conversation and noises from theaircraft,
are important for people to find out the cause of an aircrash.

[ ]

A. design
B. designing
C. designed
D. were designed

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