Much labor would have been saved if the electronic computers_____________ before.
| A．had invented | B．were invented |
| C．should have been invented | D．had been invented |
相关试题
At the end of the meeting, it was announced that an agreement ______.
| A．has been reached | B．had been reached | C．has reached | D．had reached |
Please keep me _____ what happens.
| A．informing by | B．informing of | C．informed of | D．informed by |
______ the chairman of the council, the vice chairman does duty for him.
| A．Absent from | B．In the absence of | C．Present from | D．In the presence of |
In the competition to be held, a gold medal, together with a certain sum of money, _____ the champion.
| A．will be given to who will win | B． will be given to whoever will become |
| C．has been given to whoever wins | D． was given to anyone who became |
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