More and more often we heard of people talking about Karaoke(OK).  But what on earth it is about, still remains a question for many people. Karaoke is a sort of acoustic equipment which was invented in Japan around the middle of the 1970's. It means "a band without people" in Japanese. In fact, it is just a music tape without words. This equipment first appeared in some public houses and snack bars, and mainly for the customers to enjoy themselves. Most of the music in Karaoke was popular music. Therefore, at times, when anyone felt like it, he might sing songs to the accompaniment of the music that came from the equipment. Shortly after its invention, Karaoke was spread to the whole world. It was introduced to China and was welcomed by many people. Although you are not a good singer, or even sometimes you may sing out of tune, you can always enjoy yourself by singing Karaoke. Karaoke was spread to the whole world   _  .
as soon as it was invented long before not long after it was invented before long
Question: More and more often we heard of people talking about Karaoke(OK).  But what on earth it is about, still remains a question for many people. Karaoke is a sort of acoustic equipment which was invented in Japan around the middle of the 1970's. It means "a band without people" in Japanese. In fact, it is just a music tape without words. This equipment first appeared in some public houses and snack bars, and mainly for the customers to enjoy themselves. Most of the music in Karaoke was popular music. Therefore, at times, when anyone felt like it, he might sing songs to the accompaniment of the music that came from the equipment. Shortly after its invention, Karaoke was spread to the whole world. It was introduced to China and was welcomed by many people. Although you are not a good singer, or even sometimes you may sing out of tune, you can always enjoy yourself by singing Karaoke. Karaoke was spread to the whole world   _  .
A. as soon as it was invented
B. long before
C. not long after it was invented
D. before long
Answer: