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

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

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.）

a

the
因为wonderful是形容词（adj）
又是多音节词，根据最高级的第五条定理
所以是加the加most

the,most是最高级，最高级前面要加the