题目内容
New medicines and instruments ______ every day to extend life.
- A.develop
- B.are being developed
- C.are developing
- D.have developed
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。
解析:
从语境上看,develop 不仅要用被动语态,而且要用进行时态。
练习册系列答案
相关题目