It is known to us __________ it was not until 1938 ________ the first colour TV programme began to be broadcast in the world.
| A．that, which | B．/, / | C．that, that | D．which, that |
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It is known to us __________ it was not until 1938 ________ the first colour TV programme began to be broadcast in the world.
| A．that, which | B．/, / | C．that, that | D．which, that |
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