一道PRINCETON语法

心静

Many experienced radio engineers say that at no time did the airweaves sustain a greater influx of amateur operators than in 1930s', nor has there been at any time a larger listening public than that of the early 1930s'.
B)had the airweaves sustain a greater influx of amateur operators than in 1930s', or
C)have the airweaves sustain a greater influx of amateur operators than they had in 1930s', nor
选A，我选了C，考虑应该与后面“has there been at any time a larger listening public than that of the early 1930s'.”的时态对称

donna

题目中the early 1930s'用完成时态,那么in 1930s'在the early 1930s'之后发生,那么肯定不用完成时了。

心静

可是我觉得，in 1930s'应该包括the early 1930s'这个时间段吧。

Herbert

What the word"they" in C refer to is confusing.

hz

C中的sustain可以用原形吗？

木川

C 不正确。这是比较中的时间状语的比较，加上they had多余了。