I don't know who invented telephone but it's really most wonderful invention.A. the；aB.

问题补充：

I don know who invented telephone, but its really most wonderful invention.

A. the；a

B. /；the

C. a；the

D. /；a

答案：

(答案→)A. the；a

B. /；the

C. a；the

D. /；a

解析：the telephone特指电话这类事物；a most wonderful invention意为“一项非常奇妙的发明”。