-Do you konw who invented the telephone?

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-Do you konw who invented the telephone?
-No.but it is really a most important useful invention.句中为啥用

这里没有之一的意思啊..楼上的同学,如果是it is one of the most improtant useful inventions.才是表达的之一吧.
这里只是因为invention是可数名词,你可以把所有形容词去掉,只剩主干部分,就很好理解→It is an invention.所以这里的 a 只是为了表达invention是个可数名词哈~

-Do you konw who invented the telephone? When was the telephone invented,do you konw?为什么这里用was不是were? Do you know ____?A.who invented tea B.who was the telephone 1.Do you know who invented the telephone?为什么不需要the -- do you know who invented the telephone -- no l only know Who invented the first telephone? A:When was the telephone invented,do you know? Do you know who-------- ( 发明 ) the telephone? you know when the telephone was invented? 选取：1 Do you know when the telephone----?A was invented B inv 请问Do you konw who is the man还是Do you know who the man is Do you know who ____(inwent) the telephone?