i don't know who invent the telephone,but it's really___most wonderful invention.

问题描述:

i don't know who invent the telephone,but it's really___most wonderful invention.
填a还是the 为什么

a.
一项伟大的发明.
只是伟大的发明(most winderful invention)之一.不能用the,the most wonderful invention,表示最伟大的发明(没有人敢用最伟大来形容这个发明.)