Why pleasant smells do not reduce pain in man is a question still by scientists. A. answered B. being answered C. to be answered D. that answered 查看更多

 

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Why pleasant smells do not reduce pain in man is a question still _______ by scientists.

  A. answered     B. being answered     C. to be answered    D. that answered

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Why pleasant smells do not reduce pain in man is a question still _______ by scientists.

A.answeredB.being answeredC.to be answeredD.that answered

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