If you think the radio is too noisy,you...

If you think the radio is too noisy,you can .

A．turn it on	B．turn it up
C．turn it down	D．turn off it

C 【解析】考查短语辨析，turn on 打开，turn up 放大声音,均不符合句意。turn off 关上，应改为turn it off，turn down 关小声音。故选C。

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