New medicines and instruments ______ every day to extend life.


  1. A.
    develop
  2. B.
    are being developed
  3. C.
    are developing
  4. D.
    have developed
B
解析：
從語境上看，develop 不僅要用被動(dòng)語態(tài)，而且要用進(jìn)行時(shí)態(tài)。
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