Cheap coal ________ a lot of smoke．

[　　]

A．gives up

B．gives in

C．gives away

D．gives off

答案：D
解析：

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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