Cheap coal ________ a lot of smoke.


  1. A.
    gives up
  2. B.
    gives in
  3. C.
    gives away
  4. D.
    gives off
D
give off的意思是send out smoke(vapour, etc)相當(dāng)于“釋放(出)煙、蒸汽”等;give up放棄;give away贈給,泄密;give in屈服,讓步,其后帶有賓語,要用介詞to,故只有答案D符合題意。
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