_____the beginning of the 19th century did scientists know that all matter is made up of atoms.
A,At B,By C,Up to D,Not until
相关试题
Be quick,or you’ll get______in the rain.
| A．to be caught | B．catching | C．to catch | D．caught |
He insisted______the working site.
| A．to be sent to | B．being sent to |
| C．on being sent to | D．that to be sent to |
It is not unusual for workers in that region______.
| A．to be paid more than a month later | B．to be paid later than more a month |
| C．to pay later than a month more | D．to pay later more than a mon th |
A Dream of the Red Chamber is said______into dozens of languages in the last decade.
| A．to have been translated | B．to be translated |
| C．to translate | D．to have translated |
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