﹣Quite a few new laws and rules on food safety ______ into use last month．（ ）
﹣﹣Can you tell me what they are？
A．were puttingB．have been put
C．were putD．put
﹣Quite a few new laws and rules on food safety ______ into use last month．（ ）
﹣﹣Can you tell me what they are？
A．were puttingB．have been put
C．were putD．put
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