The most frightening thing of all was that not a sound could be heard这句话中was后为什么不用what.

The most frightening thing of all was that not a sound could be heard这句话中was后为什么不用what.
The most frightening thing of all was that not a sound could be heard这句话中was后为什么不用what.

The most frightening thing of all was that not a sound could be heard这句话中was后为什么不用what.
这是一个由that引导的表语从句.当表语从句是一个陈述句时,一般用that引导.
这句话可翻译成：最令人害怕的是那种一丝声音也听不到的种死寂.

你好！

只有不知道是什么的时候才会用what
如，I don't know what he likes most.

这里说的就是一个事实，自然不用what

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