John Logie Baird constructed the first color TV in 1928, but it was not until 1938 ______ the first color TV programme was broadcast.
| A．when | B．what | C．which | D．that |
相关试题
Though the aerospace industry has made greater progress in China, the scientists will not _________ themselves ___________ this status.
| A．resign; to | B．sign; for | C．design; for | D．resign; for |
—Journalists have to work very quickly in order to ________.
—I know. I like that. It’s very challenging.
| A．earn a high salary | B．meet their deadlines |
| C．avoid being fired | D．make both ends meet |
In Beijing volunteers are making use of every minute to ________ their foreign 
languages because language volunteers must pass a written test and an interview.
| A．polish up | B．take up | C．put up | D．make up |
As is recorded in history, silkworms (蚕) were first raised by a woman in _________ is today Hebei Province.
| A．where | B．the place | C．which | D．what |
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