...e invention of refrigeration in the 20th century did raw fish sushi become more common.请教这句话中的单词do在这里应该是实义动词,不是动助动词吧?还有后面的become,因为跟在前面动词do的后面,所以应该是一个不带to的不定式吧?
下面句子的划线部分在 never 后面用了连词 and,但根据翻译来看,它否定了两者,这样用也对吗?为什么不用连词 or 呢?请老师具体说说 never…and…与never…or…的用法区别。Freddy and his band realized that they must leave the country before it...