JohnLogieBairdconstructedthefirstcolorTVin1928,butitwa...
問題詳情:
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
知識點:強調句
題型:選擇題