China’s New Food Act provides for a food recall system    to producers have to stop production      their food isn’t up to standards.
A．that; ifB．where; ifC．which; whenD．when; where
B
第一空考查定語從句，先行詞是recall system，定語從句中不缺主賓表，卻地點狀語，用where引導(dǎo)定語從句，第二空考查if引導(dǎo)的條件狀語從句，句意：中國新的食品法提供了一個召回系統(tǒng)，如果食品不達(dá)標(biāo)準(zhǔn)，生產(chǎn)者必須停止生產(chǎn)。選B。
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