One of the good things about the use of noise-killing system is it saves the need for a silencer. A. whether B. that C. how D. why 【查看更多】

 

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One of the good things about the use of noise-killing system is _________ it saves the need for a silencer.?

A.whether　B.that　C.how　D.why?

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One of the good things about the use of noise-killing system is _________ it saves the need for a silencer.


  1. A.
    whether
  2. B.
    that
  3. C.
    how
  4. D.
    why

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