题目

We have recently heard some interesting ways that 5G technology might change our lives in the future. 5G promises internet speeds between 50 to 100 times faster than the present 4G systems. The technology is also built to deal with many more users without slowing services down. Such improvements are sure to be popular for 5G users worldwide. While 5G is set to start in some limited areas of the United States this year, much of the rest of the world is not expected to receive such service widely until 2023. One project called 5G Rural First in Britain, though, is already testing this superfast When it _________ high technology, he is completely at a loss. A. refers to B. comes to　 C. happens to D. speaks to