AFTER HE HAD FINISHED HIS WORK, HE HAD CAME HOME. A B...

40. After he had finished his work, he had came home.

A B C D

V. Read the following passage, then choose the correct answer:

The invention of the phonograph happened quite by accident. Thomas Edison moved to Menlo Park,New Jersy

in 1876, where he established an industrial research laboratory. There, Edison was working on a carbon telephone

transmitter to improve the existing Bell telephone system.

In that laboratory a year later, Edison invented the phonograph while he was trying to improve a telegraph

repeater. He attached a telephone diaphragm to the needle in the telegraph repeater; in this way, he was able to

reproduce a recording that could be played back. After he made some improvements to the machine, he tested it.

He recited “Mary Had a Little Lamb” into the machine and played his voice back to a very surprised audience.