This is the (longest) flight I (have ever taken). By the time we get to Los Angeles, we (had flown) (for) 9 hours.

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问题 This is the (longest) flight I (have ever taken). By the time we get to Los Angeles, we (had flown) (for) 9 hours.

选项 A、longest
B、have ever taken
C、had flown
D、for

答案C应改为will have flown。

解析 By the time“到……时”,主语应使用将来完成时。
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