摘要：904] The firefighters the fire before the helicopeter . [译文] 在直升飞机到来之前.消防队员已经将火扑没了. A. had put out; arrived B. were putting out; arrived C. put out; arrived D. had been put out; arrived [答案及简析] A. 时态问题.救火的动作发生在前.

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