问题
选择题
China's new food law provides for a food recall system________ producers have to stop production if their food isn't up to standards.[ ]
A．where
B．that
C．when
D．which
答案
答案：A
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China's new food law provides for a food recall system________ producers have to stop production if their food isn't up to standards.[ ]
A．where
B．that
C．when
D．which
答案：A