New medicines and instruments ______ every day to extend life.A．developB．are bei
题型：不详难度：来源：
New medicines and instruments ______ every day to extend life.| A．develop | B．are being developed | | C．are developing | D．have developed |
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答案
| B |
解析
| 从语境上看，develop 不仅要用被动语态，而且要用进行时态。 |
举一反三
The College Entrance Examination________near, so you should be prepared for it.| A．is drawing | B．draws | C．drew | D．has drawn |
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----what do you think of the Chinese language today?
----Quite popular. It______ in communicating with other countries. More and more foreign friends are learning Chinese.| A．plays an important role | B．is playing an important role | | C．has played an important role | D．is being played an important role |
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--- I ________ one. Thank you just the same.| A．had | B．have had | C．would have | D．will have |
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