摘要： 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. 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．answered | B．being answered | C．to be answered | D．that answered |