are very popular with people all over the world but do you know who was it that invented

问题补充：

are very popular with people all over the world, but do you know who was it that invented telephone?

A. The telephone; 不填

B. Telephone; a

C. The telephones; the

D. Telephones; the

答案：

A. The telephone; 不填

B. Telephone; a

C. The telephones; the

(答案→)D. Telephones; the

解析：第一空用telephones表示一类事物；发明物前一般要加定冠词the。