填空题 This is the (longest) flight I (have ever taken). By the time we get to Los Angeles, we (had flown) (for) 9 hours. A. longest B. have ever taken C. had flown D. for
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【正确答案】 1、C应改为will have flown。    
【答案解析】[解析] By the time“到……时”，主语应使用将来完成时。