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  3. The changes that Atook place in air travel Bduring the last sixty years Cwould have seemed completely impossible to even the mos

The changes that Atook place in air travel Bduring the last sixty years Cwould have seemed completely impossible to even the mos

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问题 The changes that Atook place in air travel Bduring the last sixty years Cwould have seemed completely impossible to even the most brilliant scientists Dat the turn of the 19 th century.
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答案A
解析 改为have taken。过去完成时态，强调对过去发生的影响。
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考研英语一

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