单项选择 适中0.65 引用7 组卷862
I like these English songs and they ________ many times on the radio.
| A．taught | B．have taught |
| C．are taught | D．have been taught |
2008·安徽·高考真题
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Since all the preparations for the task ___________, we’re ready to start.
| A．completed | B．to be completed |
| C．had been completed | D．have been completed |
Two thirds of the task my boss assigned to me________.
| A．has completed | B．have completed |
| C．has been completed | D．have been completed |
After the age of sixteen, as , the number of our brain cells begins to decrease at a speed of several million a year.
| A．were discovered | B．have discovered |
| C．has been discovered | D．had been discovered |
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