单项选择 适中0.65 引用1 组卷88
This hi-tech equipment ________ in agriculture area, but the fund was insufficient at that time.
| A．might have been used | B．may be used |
| C．may have been used | D．should be used |
23-24高一上·全国·课后作业
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In the past few years, new inventions like 3D printers ______ to make replacement hearts and bone parts.
| A．have used | B．had used | C．have been used | D．had been used |
Some teenagers can be easy to become involved in tobacco or alcohol ________.
| A．use | B．abuse | C．abused | D．used |
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