单项选择题
A、 is built B、 is being built C、 were built D、 are being built
A.the strict control of information B.the rapid technological advances C.the complete isolation of the poor D.the existence of mainstream society
A.can buy the company or the factory B.can sell the company or the factory C.will become the owner of the company or the factory D.are one of the owners of the company or the factory