45.By 1937, it had been _____. (Last of the Airships?) A)quite safe to travel by the Hindenburg B)very dangerous to cross the Atlantic by the Hindenburg C)rare for the Hindenburg to carry passengers D)an eccentric thing to travel by airship

45.By 1937, it had been _____. (Last of the Airships?)
A)quite safe to travel by the Hindenburg
B)very dangerous to cross the Atlantic by the Hindenburg
C)rare for the Hindenburg to carry passengers
D)an eccentric thing to travel by airship

出自：英语（专升本）

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