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You could hear water pipes cracking they because of the cold. [ ]A. when; burst

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You could hear water pipes cracking they because of the cold. [ ]A. when; burst

You could hear water pipes cracking _____ they _____ because of the cold. [     ]A. when; burst  
B. before; were burst  
C. when; were burst  
D. before; burst

试题答案

D