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4、People taking earth and bricks from the Great Wall will be fined up to 500,000 yuan after Dec.1      the national regulation on protecting the Great Wall goes into effect.

   A. at which        B. that               C. when              D. how

4、C 

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People taking earth and bricks from the Great Wall will be fined up to 500,000 yuan after Dec.1      the national regulation on protecting the Great Wall goes into effect.

   A. at which        B. that               C. when              D. how

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