All the flights before nine have been delayed because of poor visibility this morning. 由于今天上午机械故障，9点钟以前的航班都被延误了。( )此题为判断题(对，错)。
All the flights before nine have been delayed because of poor visibility this morning. 由于今天上午机械故障，9点钟以前的航班都被延误了。( )
此题为判断题(对，错)。
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