19.Since the disaster, _________. (Last of the Airships?) A)people have been using airships a lot B)a lot of improvements have been made to the Hindenburg C)airships have never been seriously considered as a means of commercial transportation D)airships have seen tremendous progress in the prevention of explosion

19.Since the disaster, _________. (Last of the Airships?)
A)people have been using airships a lot
B)a lot of improvements have been made to the Hindenburg
C)airships have never been seriously considered as a means of commercial transportation
D)airships have seen tremendous progress in the prevention of explosion

出自：英语（专升本）

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