21．Milk quickly turns sour it’s in a fridge. A．until B．since C．a(chǎn)s D．unless 【查看更多】

 

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Milk quickly turns sour        it’s in a fridge.

A．until                           B．since                   C．a(chǎn)s                       D．unless

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Milk quickly turns sour ________ it’s in a fridge．

[　　]

A．until

B．since

C．as

D．unless

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