his average speed had been 299 miles per hour

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• Was his average speed incorrectly declared to be 299 miles per hour or 289 miles per hour?
• his average speed had been 299 miles per hour
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• However,a few days later,he was told that a mistake had been made.His average speed had been 301 miles per hour.为什么不用过去式?was made、 was 301 miles per hour?
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