Why pleasant smells do not reduce pain in man is a question still _______ by sci
题型：不详难度：来源：
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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答案
| C |
解析
| 考查非谓语动词。句意：为什么令人愉快的气味不能降低人的痛苦仍是科学家要回答的问题。根据语境看问题还没被解决所以用不定式的被动式做a question的定语。 |
举一反三
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