Visitors ________ not to touch the exhibits.

A．will request B．are requested

C．are requesting D．request

 

B

【解析】

因?yàn)檎f的是一條規(guī)定，所以用一般現(xiàn)在時(shí)，而visitor與request之間是動(dòng)賓關(guān)系，因此需要用被動(dòng)語態(tài)。

 

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