One of the three major commercial networks, CBS were organized in 1928【M

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问题         One of the three major commercial networks, CBS were organized in 1928【M1】__________
which its founder, William Paley, acquired ownership of a group of radio stations.【M2】__________
As the Columbia Broadcasting System expanded its operations, soon become 【M3】__________
the largest radio network in the United States, it precociously recognized the
potential for the rapidly evolved television broadcasting technology.On July 13th, 1931,【M4】__________
it began experimentally television broadcasting in New York, and ten years later【M5】__________
began regular black and white week broadcasts over its WCBW TV station 【M6】__________
in the same city, that became WCBS TV in November 1946.With Television City【M7】__________
in Hollywood, CBS launched the industry’ s first full scale
production studio.Today CBS owns television stations, radio stations,
and home video production and distribution interests.The CBS Broadcasting Group
composed of six divisions: television network, entertainment, 【M8】__________
sports, news, local television stations, and radio.For most of
commercial television history, CBS has been the leader in prime-time
ratings, having the highest-rated shows in almost every year
from the mid 1950s through the mid 1980s.During the late 1980s, however,
CBS lost its top position from NBC.CBS has traditionally been strong in 【M9】__________
the TV news area.The network began the first regular TV news program in 1948 with Douglas
Edwards as anchor, Journalism legends such as Edward R.Murrow
and Walter Cronkite gave CBS its reputation as quality news broadcaster.【M10】__________ [br] 【M2】

选项

答案 which→when/ in which

解析 作“年代”的定语从句,其引导词可以是that, which, in which或when。这须判断定语从句缺少什么成分,“its founder William Paley,acquired ownership of a group of radio stations”中,缺少时间状语,故引导词应为when或in which。
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