Choose the word or phrase that best completes each unfinished sentence below or substitutes for the underlined word or phrase.
In 1876, the telephone ______ first introduced by Bell and Watson.
was is has been had beenMôn học
Chủ đề / Chương
Bài học
Chủ đề
Choose the word or phrase that best completes each unfinished sentence below or substitutes for the underlined word or phrase.
In 1876, the telephone ______ first introduced by Bell and Watson.
was is has been had been