Time should be made good use _______our lessons well.
| A．of learning | B．to learn | C．to learning | D．of to learn |
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With some technical problems to be solved, it may be a while the system is put into use.
| A．when | B．after | C．since | D．before |
Only when you stay with local people for a period of time will you have better understanding of life here.
| A．a; 不填 | B．the; a | C．不填; the | D．the; the |
The purpose of her talking to me last night actually _______this: That I shall never trust him any more in future.
| A．comes round | B．comes out | C．comes on | D．comes to |
The price system is a complex network composed of the prices of all the products bought and sold in the economy as well as of a great number of services.
| A．the one | B．that | C．ones | D．those |
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