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[求助]有关比较的一道题
Many experienced radior engineers say that at no time [did the airwaves sustain a greater influx of amateur operators than in the 1930s,nor]has there been at any time a larger listening public than that of the early 1930s.
A. did the airwaves sustain a greater influx of amateur operators than in the 1930s,nor b. did the airwaves sustain a greater influx of amateur operators than in 1930s,or c. did the airwaves sustain a greater influx of amateur operators than they are in the 1930s,nor |
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