问题
选择题
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
答案
答案：D
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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
答案：D