Whenyoucomeintotheexhibitionhall,

发布时间：2020-07-26 16:29:38

When you e into the exhibition hall, you can see a large board with a notice on it, saying visitors ________ not to touch the exhibits.A.will requestB.requestC.are requestingD.are requested

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D解析“request sb. (not)to do sth. 要求某人(不要)做某事”是固定结构，根据题干，应使用被动语态．
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