When you come 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．request?
C．a(chǎn)re requestingD．a(chǎn)re requested
D?
“request sb.(not)to do sth.要求某人(不要)做某事”是固定結(jié)構(gòu),根據(jù)題干,應(yīng)使用被動(dòng)語態(tài)。
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