JohnLogieBairdconstructedthefirstcolorTVin1928,butitwa...
问题详情:
John Logie Baird constructed the first color TV in 1928, but it was not until 1938 _________ the first color TV program was broadcast.
A. which B. that C. when D. who
【回答】
B
知识点:强调句
题型:选择题