题目

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?

提问时间：2020-11-03

答案

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.