The changes that ——place in air travel during the last sixty years would haveseemed completely impossible to even the most brilliant scientists at the turn of the 19th century.A:took B:have taken 为什么答案是选B呢?而不是A呢?

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The changes that ——place in air travel during the last sixty years would haveseemed completely impossible to even the most brilliant scientists at the turn of the 19th century.A:took B:have taken 为什么答案是选B呢?而不是A呢?
The changes that ——place in air travel during the last sixty years would have
seemed completely impossible to even the most brilliant scientists at the turn of the 19th century.
A:took B:have taken 为什么答案是选B呢?而不是A呢?

The changes that ——place in air travel during the last sixty years would haveseemed completely impossible to even the most brilliant scientists at the turn of the 19th century.A:took B:have taken 为什么答案是选B呢?而不是A呢?
这句话的时间是during the last sixty years,在 过去的六十年里,从过去到现在的六十年是一段时间,一段时间内发生的事情用完成时态,所以B have taken.
A took是过去时,时间应是过去的某个特定时间点.

为什么要把took变成 have taken呢? The changes that took place in air travel during the last sixty years took- have taken

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