It was not until 1920_________ regular radio broadcast began.
| A．while | B．which |
| C．that | D．Since |
相关试题
Don't scold him; even an experienced engineer _____ make such a mistake after all.
| A．can | B．must | C．should | D．dare |
A survey of the opinions of scientists _____ that three hours of outdoor exercise a week
_____ good for our health.
| A．show; are | B．shows; is | C．show; is | D．shows; are |
It was last year _____ I visited the museum _____ you had visited.
| A．that; that | B．when, where | C．that; where | D．when; that |
_
_____ when to leave, I could only stay at home, _____ nothing.
| A．Knowing not; done | B．Not having known; doing |
| C．Having not known; done | D．Not knowing; doing |
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