Throughout history,thelanguage _ by a powerful group spreadsacross a civilization[ ]

________ do you have a sports meeting—Twice a year.

下列句中加点的字解释不正确的一项是

It is known to us __________ it was not until 1938 ________ the first colour TV programme began to be broadcast in the world

Students who graduate with experience will be given ________ over those who never work in any company.