电力行业长期被几家大公司垄断。

The power industry has long been dominated by a few large ___monopolies.

这个国家的电信行业被几家大公司垄断。

The telecom industry in this country is controlled by a few large ___monopolies.

这家公司在智能手机市场几乎形成了垄断。

This company has almost established ___monopolies in the smartphone market.