This is the (longest)flight I (have ever taken). By the time we get to Los Angeles, we (had flown) (for)13 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)13 hours.

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

答案C

解析 到将来的某一个时间已经完成某事,应该用将来完成时态,故将had flown改为will have flown。
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