这是一个,______________the research into jet planes.这是一个定语从句来的,修饰前面的from 1935 to 1955,很明显这是个时间段,要用during which（指from 1935 to 1955）.然后在这时间段内发生的事,用一般现在时,he concenteated on.
请问为什么用during which period
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